John Logan Community College
Selected: 3rd Pick (69th Overall)
MLB Pipeline 102nd overall:
The best junior college prospect in the 2016 Draft, Dietz likely will fall just short of becoming the highest selection in John A. Logan (Ill.) CC history, a distinction that belongs to White Sox 1994 second-rounder John Ambrose. After the Giants took Dietz in the 29th round last year, he spent the summer adding strength, which has led to more dominant stuff this year. He went 12-1, 1.22 in 13 starts with 117 strikeouts in 103 innings, ranking third in wins, fifth in ERA and seventh in whiffs among national junior college pitchers entering the Juco World Series.
After topping out at 93-94 mph in 2015, Dietz now consistently works at 91-94 mph with his fastball and has hit 98 in short stints. His slider has gotten harder and sharper as well, showing flashes of becoming a solid pitch. He also has made strides with his changeup, enhancing his chances of remaining a starter.
With his 6-foot-6 frame and three-quarters delivery, Dietz creates good angle with his pitches. The Texas Christian recruit has no problem filling the strike zone, though he'll need to improve the command of his fastball and the consistency of his secondary pitches to make it as a big league starter. If he can't, he has promise as a late-inning reliever.