1. Marcos Diplan & Trey Supak
As we’ve noted before, the Milwaukee Brewers are exceptionally right-handed throughout their organization. They only have two real left-handed prospects in their Minor League system, and neither will arrive in Milwaukee before 2021 at the earliest.
The Brewers have a ton a of right-handed pitchers in their system, and they can’t keep all of them. A glut of young, controllable arms at the Major League level is a great problem to have, but it’s going to be a challenge for pitchers not named Zack Brown to crack the 25-man roster. Marcos Diplan and Trey Supak are essentially blocked at the Major League level for the foreseeable future, and trade involving one or both could make sense for the Brewers and their young righties.
Supak posted a 2.91 ERA in 16 starts with the Biloxi Shuckers. He struck out 75 and walked 28 in 86 2/3 innings in half a season in Double-A. He boasts four solid offerings, and has above average command for a 22-year old starter.
Diplan managed a 4.58 ERA in 11 starts and one relief appearance in half a season with Biloxi. He struck out 57, and walked 36 in 57 innings in Double-A last year. He has a solid fastball/change-up combo with a useful breaking ball, but it’s clear that he still needs to work on his control.
Both Diplan and Supak ended 2018 in Double-A, and should start the 2019 season with the San Antonio Missions in Triple-A. Even if they both dominate next year, the chances of a call up before September are slim, and it’s hard to see rotation spots opening up in 2020. Unless they both transition into high-leverage relief roles, they might be stuck in San Antonio.