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John McMillon is a fantasy baseball RP prospect sleeper and minor leaguer to know. Read our MLB prospects outlooks for fantasy baseball rookies and call-ups.
PROSPECT: John McMillon, RP, Kansas City Royals
ANALYSIS: A strikeout artist out of the bullpen for Texas Tech, McMillon was signed as an undrafted free agent by the Royals after the shortened 2020 draft. He was known for his power stuff on the mound but struggled to locate his pitches.
The walk issues followed McMillon in his first two pro seasons as he walked more than 22% of hitters, though he also struck out 34% of batters. He opened the year back at Columbia, and the control finally came around to some degree.
McMillon has pushed up three levels, now pitching for Double-A Northwest Arkansas. He noted that the team changed a lot in its evaluation of pitching prospects this season, and he's taken advantage of the additional analytics to post a combined 2.62 ERA over 34 1/3 innings out of the bullpen, with an elite 65/15 K/BB.
VERDICT: McMillon is one of the top relief prospects in the game right now, with a triple-digit fastball and a wicked slider to work alongside the heater. He should find his way to the majors in 2024, but there's no rush to add him at this point until he shows it in a big-league bullpen.
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