One 2018 Breakout Star to Watch for Each Team: NL

The AL version of this list was recently published. Here is one guy to watch on each team whose name could be much more familiar by the end of the season. Age for the 2018 season given in parentheses.

Atlanta Braves: OF Ronald Acuna (Age 20)
High A/AA/AAA: 21 HR, .325/.374/.522, 44 SB, 155 wRC+ in 139 games
There are more than a few players primed for breakouts on the Braves, but perhaps none has a higher ceiling for 2017 than Ronald Acuna, the 20 year old sensation who tore up the three highest minor league levels as a teenager last season. Somehow, he got better with each promotion, and between High Class A Florida (28 games), AA Mississippi (57 games), and AAA Gwinnett (54 games), he crushed 21 home runs, stole 44 bases, and slashed .325/.374/.522 with 144 strikeouts to 43 walks in a total of 139 games. The K/BB ratio might not seem to be the prettiest, but his strikeout rate dropped with each level (from 31.7% in High A to 23% in AA to 19.8% in AAA) and his walk rate remained fairly static despite the increase in competition (6.3% to 7.4% to 7%). He'll likely begin 2018 with Gwinnett again to finish ironing out some holes in his approach, but he'll probably be up by the end of April and from there, the sky is the limit. Ender Inciarte is holding down center field, but Lane Adams is far from entrenched in left field and 34 year old Nick Markakis shouldn't be too much of a road block in right. Long story short, when he's ready, which should be very soon if not now, there will be a spot for him to play every day. With his combination of seemingly every tool, he's a star in the making. With that, don't overlook the guys listed below as others; I listed an extra one just because there are so many.
Others: 2B Ozzie Albies, SS Dansby Swanson, LHP Luiz Gohara, LHP Max Fried

Miami Marlins: OF Lewis Brinson (Age 24)
MLB: 2 HR, .106/.236/.277, 1 SB, 30 wRC+ in 21 games
AAA: 13 HR, .331/.400/.562, 11 SB, 146 wRC+ in 76 games
Perhaps the most exciting player to come to Miami in this offseason's complete tear-down was outfielder Lewis Brinson, a South Florida native bursting with tools. He hits and he hits it hard, and with his speed and defense, he's a complete player. While it is true that AAA Colorado Springs plays in a hitters' park in a generally hitter-friendly Pacific Coast League, Brinson's .331/.400/.562 slash line is still very impressive and at the very least proves he's major league ready. Though his .106/.236/.277 slash line with the Brewers was a bit less inspiring, he did draw seven walks for a very respectable 12.7% rate, proving he wasn't completely overmatched. Additionally, three of his five hits went for extra bases (including two home runs), so his power transferred up in the small sample as well. With Giancarlo Stanton, Marcell Ozuna, Christian Yelich, and Ichiro Suzuki all gone from last year's outfield, the stage is set for him to try his hand as a starter in the Marlins' outfield.
Others: 3B Brian Anderson, RHP Sandy Alcantara, OF Magneuris Sierra

New York Mets: SS Amed Rosario (Age 22)
MLB: 4 HR, .248/.271/.394, 7 SB, 74 wRC+ in 46 games
AAA: 7 HR, .328/.367/.466, 19 SB, 116 wRC+ in 94 games
All projection and no track record as recently as the start of the 2016 season, Amed Rosario broke out by slashing .324/.374/.459 with 19 stolen bases between High Class A Port St. Lucie and AA Binghamton that year, then continued to mash with a .328/.367/.466 line and 19 more stolen bases at AAA Las Vegas in 2017. This performance earned a call-up for the 21 year old shortstop, who held his own by slashing .248/.271/.394 across 46 major league games. Rosario is a great defender who has proven bat to ball and running abilities, looking like a future leadoff man if he can learn to take a walk. Unfortunately, the latter may take some time, considering his horrendous 49/3 strikeout to walk ratio with the Mets this past season, though his 87/40 and 67/23 marks in the minors in 2016 and 2017, respectively, are much better. I don't think Rosario will be an instant star in New York, but 2018 could see him begin to build towards that goal.
Others: 1B Dominic Smith, RHP Robert Gsellman, RHP Seth Lugo

Philadelphia Phillies: SS J.P. Crawford (Age 23)
MLB: 0 HR, .214/.356/.300, 1 SB, 83 wRC+ in 23 games
AAA: 15 HR, .243/.351/.405, 5 SB, 114 wRC+ in 127 games
One of the most highly regarded Phillies prospects in recent memory, Crawford has seen his star fade just a little bit upon reaching AAA. In 87 games with Lehigh Valley in 2016, he slashed just .244/.328/.318, and he wasn't much better in the first half of 2017, slashing .211/.328/.330 in 76 games. However, he turned it around in the second half, slashing .287/.385/.513 in 51 games for the IronPigs and earning a call-up to Philadelphia in September. His bat was light in those 23 games (.214/.356/.300), but the second half turnaround was just what the Phillies wanted to see. Crawford should have an easier time adjusting to the majors than most minor leaguers because of his extremely advanced approach at the plate, which helped him to a solid 97/79 strikeout to walk ratio at AAA this year. Even after his promotion to the majors, he held a 22/16 ratio, showing he could spot major league fastballs and offspeeds, so now the only step left is for him to start punishing mistakes.
Others: RHP Nick Pivetta, C Jorge Alfaro, RHP Ben Lively

Washington Nationals: OF Victor Robles (Age 20-21)
MLB: 0 HR, .250/.308/.458, 0 SB, 96 wRC+ in 13 games
High A/AA: 10 HR, .300/.382/.493, 27 SB, 147 wRC+ in 114 games
We round out the NL East with yet another high ceiling, athletic position player, and Victor Robles may end up being the best of them all. Robles, who doesn't turn 21 until May 19th, is currently the youngest player ever to suit up in the majors, and joins Ozzie Albies (January birthday) as one of only two MLB players born in the year 1997. Robles began the season at High Class A Potomac, but slashed .289/.377/.495 with 16 stolen bases in 77 games to force a promotion to AA Harrisburg, where he kept on hitting to the tune of a .324/.394/.489 slash line and 11 stolen bases in 37 games. In the majors for the month of September, he put up a respectable .250/.308/.458 line over 13 games, showing that he is at least ready for a shot. He'll likely start with some seasoning in AAA, but once he comes up, he can impact the game in a multitude of ways. For starters, he's blazing fast and has a cannon arm, making him a potential Gold Glove defender in center field, and he has great plate discipline for such a young player. Combine that with his athleticism and natural feel for the barrel, and he can post high on-base percentages and be a perfect leadoff man. The only area where he doesn't excel is power, but he should generate average pop and with his strong, athletic build, could max out as an Andrew McCutchen-type player. On top of it all, he is considered to have a great head on his shoulders, and that will be invaluable when his chance in the big leagues comes, likely sooner rather than later.
Others: RHP A.J. Cole, RHP Erick Fedde, OF Andrew Stevenson

Chicago Cubs: RHP Eddie Butler (Age 27)
MLB: 4-3, 3.95 ERA, 1.43 WHIP, 30/28 K/BB, 54.2 IP in 13 games (11 starts)
AAA: 2-0, 2.17 ERA, 1.34 WHIP, 30/12 K/BB, 45.2 IP in 8 starts
It's tough to pinpoint any real breakout candidate on the Cubs, considering pretty much every position is set with veterans or otherwise proven players. That said, if any of Jon Lester, Yu Darvish, Kyle Hendricks, Jose Quintana, or Tyler Chatwood gets hurt, Eddie Butler could be the guy who steps up and makes an impact. Butler pushed himself into the national prospect conversation by dominating the mid-minor leagues in 2013 (9-5, 1.80 ERA, 0.99 WHIP, 143/52 K/BB across three levels), but the former Radford Highlander never quite figured it out with the Rockies, going 6-16 with a 6.50 ERA and a 1.77 WHIP in parts of three seasons with them. Traded to the Cubs in 2017, he finally found his footing in the majors, going 4-3 with a 3.95 ERA and a 1.43 WHIP over 13 games (11 starts), and he could springboard off of that in 2018 if given the opportunity (though fellow starters Mike Montgomery and Jen-Ho Tseng will also gun for a spot in the case of an injury).
Others: OF Albert Almora, C Victor Caratini, RHP Jen-Ho Tseng

Cincinnati Reds: RHP Luis Castillo (Age 25)
MLB: 3-7, 3.12 ERA, 1.07 WHIP, 98/32 K/BB, 89.1 IP in 15 starts
AA: 4-4, 2.58 ERA, 1.01 WHIP, 81/13 K/BB, 80.1 IP in 14 starts
Traded as a part of the Casey McGehee deal of 2014, the Andrew Cashner deal of 2016, and the Dan Straily deal of 2017, Luis Castillo is making the Giants, Padres, Marlins regret their decisions. He dominated AA in 2017 (2.58 ERA, 1.01 WHIP, 81/13 K/BB with Pensacola) before a call-up to Cincinnati, where he continued to mow down hitters to the tune of a 3.12 ERA, a 1.07 WHIP, and a 98/32 strikeout to walk ratio. Interestingly, his strikeout rate actually went up after his promotion to the majors, having struck out 25.6% of AA hitters and 27.3% of major league hitters. He likely won't best his half-season rate stats from 2017, but those numbers held over a full season are borderline ace level. If his 2017 stats were for real, which I believe they may have been, then Castillo is the next face of the Reds rotation and that could begin in 2018.
Others: OF Jesse Winker, RHP Sal Romano, RHP Robert Stephenson

Milwaukee Brewers: LHP Josh Hader (Age 24)
MLB: 2-3, 2.08 ERA, 0.99 WHIP, 68/22 K/BB, 47.2 IP in 35 games
AAA: 3-4, 5.37 ERA, 1.54 WHIP, 51/31 K/BB, 52 IP in 12 starts
Drafted in the 19th round out of a Maryland high school way back in 2012, Josh Hader slowly climbed the minor league ladder while dominating his competition, going 23-17 with a 2.68 ERA and a 1.15 WHIP over 101 games (69 starts) up through his promotion to AAA Colorado Springs in 2016, striking out 471 and walking 171 in 420.1 innings. However, he struggled to adjust to the extremely hitter-friendly conditions in Colorado Springs and the Pacific Coast League, and in 26 starts since that promotion, he is 4-11 with a 5.28 ERA and a 1.48 WHIP. The Brewers decided to give him a change of scenery by not only promoting him to the majors, but shifting him to the bullpen as well. It worked, as Hader dominated major league hitters to the tune of a 2.08 ERA, a 0.99 WHIP, and a 68/22 strikeout to walk ratio in 47.2 innings. Manager Craig Counsell has said that he will begin 2018 in the bullpen again, but a move to the rotation is certainly possible and Hader has the stuff to do it. In a best case scenario, Hader could become a mid-rotation force or better for the Brewers in the near future, and even if that isn't the case, he has proven he is very effective as a power reliever.
Others: RHP Brandon Woodruff, RHP Luis Ortiz, RHP Corbin Burnes

Pittsburgh Pirates: RHP Tyler Glasnow (Age 24)
MLB: 2-7, 7.69 ERA, 2.02 WHIP, 56/44 K/BB, 62 IP in 15 games (13 starts)
AAA: 9-2, 1.93 ERA, 0.95 WHIP, 140/32 K/BB, 93.1 IP in 15 starts
Tyler Glasnow is about as enigmatic as it gets. The 6'8" right hander has absolutely obliterated minor league hitting to the tune of a 45-21 record, a 2.02 ERA, a 1.07 WHIP, and a 785/278 strikeout to walk ratio in 593.1 innings. This utter domination includes AAA, where he is a career 19-6 pitcher with a 1.95 ERA, a 1.11 WHIP, and a 321/116 strikeout to walk ratio over 244.1 innings. The trouble, however, has been translating that success just one more step to the majors. Over 22 major league outings over the past two seasons (including 17 starts), he is 2-9 with a 6.75 ERA and a 1.88 WHIP, striking out 80 and walking 57 in 85.1 innings. He still has that blazing mid to upper 90's fastball, but his command has been non-existent and hitters have been able to punish his mistakes. While he struck out 38.5% of those he faced in AAA this year, that number stood at just 18.4% in the majors, while his walk rate jumped from 8.8% to 14.4%. Glasnow does have an opportunity to jump back into the rotation if one of Jameson Taillon, Ivan Nova, Joe Musgrove, Chad Kuhl, or Trevor Williams gets hurt or becomes ineffective, and if he can put it together in 2018, he could finally become the rotation force the Pirates have envisioned for years. However, the Pirates have stated that they are open to using him in the bullpen this year, where his fastball could play up into the upper 90's and he could focus his energy. Either way, this could be the year Glasnow finds success, even if it's not the ace-level success some envisioned when he was climbing through the minors.
Others: 3B Colin Moran, OF Jordan Luplow, OF Austin Meadows

St. Louis Cardinals: RHP Miles Mikolas (Age 29)
NPB (Japan): 14-8, 2.25 ERA, 0.98 WHIP, 187/23 K/BB, 188 IP in 27 starts
Last year, Eric Thames made a triumphant return from three years in South Korea to blast 31 home runs for the Brewers. This year, their NL Central rivals are hoping to catch the same lightning in a bottle, this time from Japan. Miles Mikolas (Mikolas pronounced like Mike) was last season in the U.S. going 2-5 with a 6.44 ERA and a 1.43 WHIP over 10 starts for the Rangers in 2014, so he headed to Japan to play for the Yomiuri Giants. Apparently, something clicked for him over there, and in three seasons in the NPB, Mikolas went 31-13 with a 2.18 ERA, a 0.99 WHIP, and a 378/69 strikeout to walk ratio over 424.2 innings in 62 starts. His strikeout rate went up each year, from 14.9% in 2014, his final year in the MLB to 19.2% in his first year in Japan in 2015, to 22% in 2016, and finally up to 25.1% in 2017. Meanwhile, he posted a career-low 3.1% walk rate this year, and the Cardinals liked his performance enough to give him a two year, $15.5 million deal. He apparently upped his velocity during his time in Japan while refining his secondary pitches, all while maintaining and even improving the stellar command he had in the states. Eric Thames showed us that it isn't impossible for American returnees from Asia to make an impact right away, and Mikolas will look to follow in his footsteps.
Others: RHP Luke Weaver, RHP Jack Flaherty, RHP Alex Reyes

Arizona Diamondbacks: RHP Taylor Clarke (24-25)
AA/AAA: 12-9, 3.35 ERA, 1.21 WHIP, 138/52 K/BB, 145 IP in 27 starts
There aren't many openings in the Arizona lineup for new guys to break in, and the rotation looks set with Zack Greinke, Robbie Ray, Taijuan Walker, Patrick Corbin, and Zack Godley. However, one is bound to get hurt, and Braden Shipley and Taylor Clarke look like frontrunners to take that spot if it comes up. Originally drafted in the third round out of the College of Charleston as a senior in 2015, Clarke pitched very well in 2015 and 2016 and began 2017 with AA Jackson, where he put up a very strong 2.91 ERA, a 1.19 WHIP, and a 107/39 strikeout to walk ratio in 111.1 innings. Promoted to AAA Reno not long after his 22nd birthday, Clarke finally found a challenge in the hitter-friendly environment, going 3-2 with a 4.81 ERA and a 1.25 WHIP over six starts, striking out 31 and walking 13 in 33.2 innings. Still, his strikeout rate remained stable by dropping just two points from 23.5% to 21.5%, as did his walk rate by rising from 8.6% to 9%. A fly ball pitcher, he was hurt by the thin air of the Pacific Coast League, and while Arizona has some pretty thin air as well, they just introduced a humidor to try to mitigate that effect. The humidor could be a huge help for Clarke, and if given the chance, the Ashburn, Virginia native could make an impact on the NL West pennant race.
Others: RHP Braden Shipley, 2B Ketel Marte, RHP Jimmie Sherfy

Colorado Rockies: 1B Ryan McMahon (Age 23)
MLB: 0 HR, .158/.333/.211, 0 SB, 46 wRC+ in 17 games
AA/AAA: 20 HR, .355/.403/.583, 11 SB, 157 wRC+ in 119 games
A year ago, Ryan McMahon was in a very different position, coming off a season in which he struggled for the first time in his career (12 HR, .242/.325/.399 in 133 games at AA), and he was set to repeat the level to start his 2017 season. However, this time around, he proved 2016 to be a fluke and slashed .326/.390/.536 with six home runs in 49 games, forcing a promotion to AAA Albuquerque. There, in the hitter-friendly environment, he moved himself from "good" to "elite" in the prospect rankings, slashing .374/.411/.612 with 14 home runs in 70 games, finding himself in the majors by August. While he struggled against major league pitching (.158/.333/.211), he did manage five walks against five strikeouts, and if he can get just a bit more loft on the ball (he's primarily a ground ball hitter), his power could take off at Coors Field. He has a clear path to starting at first base this season, so watch for McMahon's bat in the thin air.
Others: OF Raimel Tapia, RHP Jeff Hoffman, C Tom Murphy

Los Angeles Dodgers: RHP Walker Buehler (Age 23-24)
MLB: 1-0, 7.71 ERA, 2.04 WHIP, 12/8 K/BB, 9.1 IP in 8 games
High A/AA/AAA: 3-3, 3.35 ERA, 1.11 WHIP, 125/31 K/BB, 88.2 IP in 28 games (19 starts)
The Dodgers seemingly always have breakout guys who jump into the national conversation early on. Last year, it was Cody Bellinger. The year before, it was Corey Seager. Before that, you had guys like Yasiel Puig and Justin Turner turning into stars. This year, there are two main candidates to be the next guy, and I'm going to write up Walker Buehler over Alex Verdugo. Buehler was drafted in the first round, 24th overall, as part of a standout Vanderbilt class in 2015, following Dansby Swanson (1st) and Carson Fulmer (8th). However, it would be over a year before Buehler stepped foot on a minor league mound after undergoing Tommy John surgery, and he didn't really get his career going until 2017. However, he dominated High Class A in five starts (1.10 ERA, 0.80 WHIP, 27/5 K/BB) and found himself in AA, where he continued to pitch well (3.49 ERA, 1.12 WHIP, 64/15 K/BB). He finally found a challenge with AAA Oklahoma City, putting up a respectable 4.63 ERA, a 1.29 WHIP, and a 34/11 strikeout to walk ratio in the hitter-friendly environment. Promoted to the majors for eight relief appearances, he was knocked around a bit (7.71 ERA, 2.04 WHIP), but he did strike out 27.3% of those he faced (12 in 9.1 innings). The Dodger rotation looks to consist of Clayton Kershaw, Rich Hill, Alex Wood, Hyun-Jin Ryu, and Kenta Maeda, but if one gets injured (and with Hill and Ryu in there, one probably will), Buehler could be the first to hear his name called. If he can ring in his command just a little, his stuff is nasty enough (upper 90's fastball, plus curveball), he could give the Dodgers a third straight NL Rookie of the Year Award winner.
Others: OF Alex Verdugo, RHP Brock Stewart, RHP Dennis Santana

San Diego Padres: RHP Dinelson Lamet (Age 25-26)
MLB: 7-8, 4.57 ERA, 1.24 WHIP, 139/54 K/BB, 114.1 IP in 21 starts
AAA: 3-2, 3.23 ERA, 1.33 WHIP, 50/20 K/BB, 39 IP in 8 starts
Dinelson Lamet didn't make his minor league debut until he was 22, which is old for a Dominican prospect, but he rose quickly once he got on the professional mound. In full season ball by 2015, he jumped three levels in 2016 and began 2017 at AAA El Paso in the hitter-friendly Pacific Coast League. However, nobody seemed to tell Lamet that the environment was supposed to be difficult, and after eight solid starts (3.23 ERA, 1.33 WHIP, 50/20 K/BB), he was promoted to the majors. Making 21 starts for the Padres, he struggled a bit with command (11.1% walk rate), but hitters had a tough time connecting with his nasty stuff and he struck out 28.7% of those he faced, or 139 in 114.1 innings. Unfortunately, his walk rate did rise throughout the year, but if he can keep his stuff in check, it's nasty enough to make him a mid-rotation starter and to build on the 4.57 ERA from this year. The Padres are still rebuilding, so as long as he stays healthy, he should have no problem earning a spot in the rotation and could thrive.
Others: RHP Luis Perdomo, OF Hunter Renfroe, RHP Kaz Makita

San Francisco Giants: RHP Chris Stratton (Age 27)
MLB: 4-4, 3.68 ERA, 1.48 WHIP, 51/28 K/BB, 58.2 IP in 13 games (10 starts)
AAA: 4-5, 5.11 ERA, 1.46 WHIP, 71/22 K/BB, 79.1 IP in 15 starts
The Giants are doing their best to go worst to first this year, adding numerous bats including Andrew McCutchen and Evan Longoria. However, the pitching staff has remained mostly untouched, especially in the starting department, leaving two unproven guys to take the #4 and #5 spots. Chris Stratton, Tyler Beede, and Andrew Suarez are frontrunners, but Stratton has a particularly strong case and could be in for a big season. Picked 20th overall out of Mississippi State in 2012, he developed slowly didn't get his first extended look in the majors until 2017, his age-26 season. In it, he was successful, going 4-4 with a 3.68 ERA and a 1.48 WHIP over 13 games (10 starts), but there is certainly room for improvement. His 10.9% walk rate was a bit high, but his walk rate trended down slightly as the season moved on. With a full season in pitcher-friendly San Francisco, Stratton could finally fulfill his mid-rotation potential.
Others: RHP Tyler Beede, LHP Andrew Suarez, 2B Miguel Gomez

Minor League Awards

With the minor league season coming to a close, it's time to hand out the awards for the best hitters and pitchers. Please note that this is not based on prospect status, but on performance. Performance in different levels will be weighed roughly the same to allow the awards to expand outside of just AA and AAA, though players from higher levels will get a closer look. Some general minor league information: the levels are, from highest to lowest, AAA, AA, High A, Class A, Short Season A, Rookie, and complex (GCL, AZL, DSL, VSL). The California League (one of three leagues in High A) is extremely hitter-friendly and gives a Coors Field-type effect to players' stats, while the Pacific Coast League (one of two leagues in AAA) and Pioneer League (one of two Rookie leagues) are also very hitter-friendly. The Florida State League (one of three leagues in High A) is very pitcher-friendly, and the Texas League (one of three leagues in AA) and Midwest League (one of two leagues in Class A) also lean pitcher-friendly. Most others are relatively neutral. I'll also reference my 2015, 2016, and 2017 draft rankings a fair amount. The way I weight them is like this: 2015 was just a learning year, one where I made my first list through trial with no error yet to learn from. 2016 was my warm-up year, the one where I had been through a year of rankings but still didn't have much error to learn from. 2017 was my first real year.

Minor League Hitter of the Year

Winner: Bo Bichette (Blue Jays Class A and High A): 14 HR, 74 RBI, .362 AVG, 22 SB, 181 wRC+

If you want to see some crazy numbers, look no further than Blue Jays prospect Bo Bichette. One of two Jays' teenagers/sons of MLB stars to post huge breakout seasons (see Vladimir Guerrero Jr.), the son of Dante Bichette has blown every expectation out of the water. Drafted in the second round (66th overall) out of a Florida high school in 2016, I liked his swing but had just enough doubt in his ability to tone it down that I ranked him 77th. As it turns out, he'd be a top ten or even top five pick if the draft happened again. Bichette tore up the complex-level Gulf Coast League immediately following his signing in 2016 (.427/.451/.732 in 22 games) and picked up right where he left off in 2017. Less than a year after graduating high school, the 19 year old was assigned to Class A Lansing in the Midwest League, where he absolutely ripped the cover off the ball, slashing .384/.448/.623 with 32 doubles, three triples, and ten home runs in 70 games, adding in 12 stolen bases in 15 tries to boot. This added up to a ridiculous .476 wOBA and a 201 wRC+, forcing the Jays to move their budding star to High Class A Dunedin in the tough Florida State League. There, he turned a bit more human (until you remember he's still 19 years old), slashing .323/.379/.463 with nine doubles, a triple, four home runs, and ten stolen bases in 40 games. Combined, he finished his season slashing .362/.423/.565 with 41 doubles, four triples, and 14 home runs, giving him 59 extra base hits in 110 games to go along with 22 stolen bases and a very high OBP. If he can begin to turn those doubles into home runs, Bichette has a very good chance to be an All Star at the next level.

Runner-Up: Austin Hays (Orioles High A and AA): 32 HR, 95 RBI, .329 AVG, 5 SB, 164 wRC+

It may just be Hays' first full pro season, but he's already made a mockery out of three different levels. After being drafted in the third round (91st overall) out of Jacksonville University in 2016, he slashed .336/.386/.514 with four home runs in a 38 game debut in the New York-Penn League. To start the season, he was handed an aggressive assignment to High Class A Frederick, where he did nothing but rake. Over 64 games, he slashed .328/.364/.592 with 16 home runs, posting a .422 wOBA and a 167 wRC+ for the Keys. Promoted to AA Bowie two weeks before his 22nd birthday and barely a year after he was drafted, he put up virtually the same numbers, slashing .330/.367/.594 with 16 home runs, a .418 wOBA, and a 161 wRC+ over 64 games. That's a combined 32 home runs and an OPS of .958 this season for the Daytona Beach native. As I was writing this paragraph, the Orioles called him up to the major leagues, where he could be a significant piece in the Baltimore lineup in time. I ranked him 117th in my 2016 rankings, 26 spots below where the Orioles took him, and I admittedly overlooked his offensive capability. I noted his quick swing and his knack for making contact, but I was worried about his balance and power projection and those now seem like they won't be issues. Hays' one spot for improvement offensively this year is in his patience, as he walked in just 4.4% of his plate appearances. Going forward, that will be important, and his lack of OBP skills could turn him into a Yulieski Gurriel type hitter at the next level.

Honorable Mention: Ronald Acuna (Braves High A, AA, and AAA): 21 HR, 82 RBI, .325 AVG, 44 SB, 155 wRC+

Acuna is one of this year's biggest breakout stars, and his huge season has put him at or near the top of every updated prospect list out there. He was profiled a few weeks ago in my Minor League Watch, and with good reason. The 19 year old has played at three levels this year and has actually improved at each stop. He slashed .287/.336/.478 (.370 wOBA, 135 wRC+) in 28 games at High Class A Florida in the tough Florida State League, then slashed .326/.374/.520 (.404 wOBA, 159 wRC+) in 57 games at AA Mississippi, followed by a .344/.393/.548 line (.413 wOBA, 162 wRC+) in 54 games at AAA Gwinnett. He's getting better and better with each promotion, and the best part is that he's still a teenager. Even his strikeout rate dropped from 31.7% at High A to 23% at AA and 19.8% at AAA, while his walk rates have remained mostly steady (6.3%, 7.4%, 7.0%). He's probably a bit too raw to play in the majors today, as he needs to continue to make progress on his approach, but every arrow points towards "future superstar" for Acuna. I haven't even mentioned that he stole 44 bases this year, albeit while being caught 20 times.

Others: Rhys Hoskins (PHI AAA: 29 HR, 91 RBI, .284 AVG, 4 SB, 166 wRC+), Ryan McMahon (COL AA and AAA, 20 HR, 88 RBI, .355 AVG, 11 SB, 157 wRC+), Jeremy Barfield (BOS AA and AAA, 28 HR, 76 RBI, .293 AVG, 1 SB, 161 wRC+), Nick Senzel (CIN High A and AA, 14 HR, 65 RBI, .321 AVG, 14 SB, 164 wRC+)

Even when you don't include Rhys Hoskins' incredible first month in the majors, he was having a special season, slashing .284/.385/.581 with 29 home runs over 115 games at AAA Lehigh Valley. Those look like pretty good numbers on the surface, but when you adjust for the fact that the International League tends to lean a tad pitcher-friendly, you get an excellent 166 wRC+, better than both Hays (164) and Acuna (155). Combine his 26 MLB games and the man has 41 home runs with a .291/.395/.614 line over 141 games. Ryan McMahon slashed .326/.390/.536 with six home runs in 49 games at AA Hartford before a promotion to AAA Albuquerque, where he caught fire in the hitter-friendly environment. In 70 games, the 22 year old slashed .374/.411/.612 with 14 home runs and 23 doubles, earning a promotion to the major leagues for the Rockies. Jeremy Barfield spent most of 2017 with AA Portland, where he slashed .288/.359/.584 with 27 home runs in the pitcher-friendly environment. He got a brief, three game promotion to AAA Pawtucket, where he cracked five hits, including a home run, in eleven at bats while walking four times in the series against Rochester. Lastly, Nick Senzel was picked second overall by the Reds in 2016 out of the University of Tennessee, and so far, he's lived up to the billing. Starting the season at High Class A Daytona in the Florida State League, he slashed .305/.371/.476 with four home runs and 26 doubles in 62 games. Promoted to AA Pensacola, he caught fire, slashing .340/.413/.560 with ten home runs over 57 games, and if it weren't for an injury at the end of the season, he might have earned a call-up to the big club in September.

Minor League Pitcher of the Year

Winner: Jon Duplantier (ARI Class A and High A): 12-3, 1.39 ERA, 0.98 WHIP, 165/42 K/BB

After overlooking Austin Hays and being conservative with Bo Bichette, I had better luck with the pitchers in my 2016 rankings. Jon Duplantier, then with Rice University, ranked 45th in my rankings before the 2016 draft due to his nasty stuff, but he lasted until pick 89 (3rd round) due to shoulder concerns. Turns out my optimism paid off, as Duplantier has absolutely dominated this season. Starting off at Class A Kane County, he completely overmatched his opponents, going 6-1 with a 1.24 ERA and a 0.83 WHIP, striking out 78 and walking just 15 in 72.2 innings for the Cougars. Promoted to High Class A Visalia in the extremely hitter-friendly California League, he seemingly forgot that he was in a hitters' paradise and went 6-2 with a 1.56 ERA and a 1.15 WHIP, this time striking out 87 and walking 27 in 63.1 innings. Combined, that's a 1.39 ERA and a very strong 34.1 strikeout percentage. In his 25 games, all but one of which lasted at least 5 innings, he never allowed more than three earned runs in any start and allowed either zero or one earned run in 19 of the 25. I noted before the 2016 draft that health aside, Duplantier's ticket to a big league rotation would be improving his command, and it looks like he has made progress there. Total batters faced/walk percentage data isn't available for Duplantier's time at Rice, but we can look at the slightly inferior walks per nine innings. In his junior year at Rice in 2016, he walked 3.81 per nine, but that fell to 1.86 at Class A this year. It jumped back up to 3.84 at High A, but that's in a very hitter-friendly environment following a promotion so we can give him the benefit of the doubt. He still has work to do on his command, but he has become one of the lone bright spots in a very barren Diamondbacks farm system.

Runner-Up: Corbin Burnes (MIL High A and AA): 8-3, 1.67 ERA, 0.95 WHIP, 140/36 K/BB

Two pitchers, two wins for my 2016 draft rankings. I ranked the then-St. Mary's pitcher 48th due to his athleticism, velocity, and promising offspeed stuff, but industry concerns about the future development of said offspeed pitches as well as questions about his durability dropped him to the fourth round, where the Brewers took him 111th. Apparently, those offspeed pitches came along like I predicted, as he absolutely dominated the mid minors this year. Starting off in High Class A Carolina, he couldn't have been any better, going 5-0 with a 1.05 ERA and a 0.88 WHIP over ten starts, striking out 56 and walking 16 in 60 innings. Promoted to AA Biloxi, the 22 year old was still great, going 3-3 with a 2.10 ERA and a 1.00 WHIP, this time striking out 84 and walking just 20 in 85.2 innings. On August 21st, in a AA game against Mobile (Angels AA), he tossed eight shutout innings on just two hits and two walks, striking out eight BayBears while throwing just 94 pitches. He should be in the big league rotation, assuming there is space, by next season. Combined with his 2.02 ERA in 2016, he now has a career 1.74 ERA through 181.1 minor league innings. 

Honorable Mention: Jack Flaherty (STL AA and AAA): 14-4, 2.18 ERA, 1.04 WHIP, 147/35 K/BB

Flaherty, a 2014 first round pick out of the same California high school that produced Lucas Giolito and Max Fried, broke out this year in a big way. His first three pro seasons were pretty good (including a 2.84 ERA at Class A Peoria in 2015), but 2017 was something else entirely. Beginning his season at AA Springfield, he completely shut down Texas League competition by going 7-2 with a 1.42 ERA, a 0.92 WHIP, and a 62/11 strikeout to walk ratio in 63.1 innings. Promoted to AAA Memphis in the hitter-friendly Pacific Coast League, he became more human but still put up very dominant numbers considering the league production, going 7-2 (again) with a 2.74 ERA, a 1.14 WHIP, and an 85/24 strikeout to walk ratio over 85.1 innings. That earned him a promotion to the big club, and he made his MLB debut with the Cardinals on September 1st. Overall, 2017 could not have gone any better for the 6'4" righty, who added a few miles per hour to his fastball and sharpened his offspeed pitches this year. Throw in Luke Weaver (MLB), Alex Reyes (MLB/AAA), Zac Gallen (AAA), Dakota Hudson (AAA), and Austin Gomber (AA), and aside from the Braves, the Cardinals may have the best crop of advanced young pitching in baseball. 

Others: Tyler Mahle (CIN AA and AAA: 10-7, 2.06 ERA, 0.96 WHIP, 138/30 K/BB), Rogelio Armenteros (HOU AA and AAA: 10-4, 2.04 ERA, 1.04 WHIP, 146/38 K/BB), Joey Lucchesi (SD High A and AA: 11-7, 2.20 ERA, 0.97 WHIP, 148/33 K/BB), Merandy Gonzalez (MIA Class A and High A: 13-3, 1.66 ERA, 0.97 WHIP, 103/26 K/BB)

Tyler Mahle had possibly the best single month of any pitcher this year, starting off his season 4-0 with a 0.55 ERA and a 0.52 WHIP over five April starts for AA Pensacola, including a perfect game against Mobile (Angels AA). Over 14 AA starts, he ultimately finished 7-3 with a 1.59 ERA, a 0.87 WHIP, and an 87/17 strikeout to walk ratio over 85 innings before being promoted to AAA Louisville. There, he succeeded again, finishing 3-4 with a 2.73 ERA and a 1.10 WHIP over ten starts, striking out 51 and walking 13 in 59.1 innings before earning a call-up to the Reds at the end of August. Rogelio Armenteros broke out in a huge way in 2017, starting off by dominating the Texas League by going 2-3 with a 1.93 ERA and a 1.04 WHIP over 14 games (10 starts), striking out 74 and walking 19 in 65.1 innings for AA Corpus Christi. Promoted to AAA Fresno in the tough Pacific Coast League, he was just as good, going 8-1 with a 2.16 ERA and a 1.05 WHIP, striking out 72 and walking 19 in 58.1 innings. On August 26th, the Cuban native shut down Tacoma (Mariners AAA) through eight innings, allowing just one hit and one walk while striking out eight. Joey Lucchesi was drafted in the fourth round out of Southeast Missouri State in 2016, and began the year in the extremely hitter-friendly California League. No worries, as he went 6-4 with a 2.52 ERA and a 0.95 WHIP over 14 starts for High Class A Lake Elsinore, striking out 95 and walking just 19 in 78.2 innings. At AA San Antonio, he went 5-3 with a 1.79 ERA and a 0.99 WHIP, striking out 53 and walking 14 in 60.1 innings. Lastly, we have Merandy Gonzalez, who broke out this year with a huge season in the mid minors. Starting with Class A Columbia in the Mets organization, Gonzalez went 8-1 with a 1.55 ERA and a 0.90 WHIP, striking out 65 and walking 13 in 69.2 innings. That performance earned him a call-up to High Class A Port St. Lucie, but he was traded to the Marlins at the deadline in the A.J. Ramos deal and finished out the season at High Class A Jupiter. Between Port St. Lucie and Jupiter, both in the Florida State League, he put up more excellent numbers, going 5-2 with a 1.78 ERA and a 1.05 WHIP, striking out 38 and walking 13 in 60.2 innings. The combined ERA of 1.66 tempted me to rank him higher, but I kept him seventh due to the pitcher-friendly nature of the Florida State League as well as his low strikeout rate in that league (15.4%).