Delivery is high 3/4; good drive off back foot; max effort; rocks with high leg kick: Loses efficiency of command when he puts too much exertion in the delivery; will occasionally fly open.
Erie SeaWolves (AA, Tigers)
Fastball sat 94-95 mph; topped at 96 mph; excellent plane; can straighten out at higher velocity; lacks late life at times; command loose; potential 70 grade fastball with better command; 60 grade if cannot tighten command.
Backbreaker; 79-81 mph; big drop with tight spin; potential plus-plus pitch with two-plane break; ability to hide pitch out of hand; repeats same delivery and arm action as FB; ability to command the pitch; control needs refinement to reach true plus-plus ceiling; fools minor league umpires and will often not get the correct call.
He is a power reliever with ability to work the back end of a bullpen; attacks hitters and has a competitive mentality; composed himself after walking a batter.
I did not see any of the immaturity concerns, but the competitive nature was extremely evident. He wants to be the man, and he wants it on every pitch. This is a legitimate reliever with two plus to plus-plus pitches. Knebel will be in the Tigers bullpen soon and his arsenal should play well as a max effort, one inning guy.