Szapucki was one of the top pop-up prospects in baseball last year, striking out more than 40 percent of the batters he faced across stops in the Appalachian League and the New York-Penn League. A run of three straight starts with double-digit strikeouts with short-season Brooklyn came to an end in mid-August when he was shut down with back stiffness -- an issue he has dealt with in the past. He operates with a mid-90s fastball with late arm-side run, a curveball with the best spin rate in the entire 2015 draft class that he can throw for strikes or use as a chase pitch, and a changeup that is still a work in progress. His low three-quarters delivery allows his pitches to explode on hitters and his left-handedness makes the whole package pretty unfair. There is no question he could be a lethal late-inning reliever, but the Mets will obviously continue to develop him as a starter. If he can prove himself to be durable and can improve his command, the repertoire and delivery would allow him to pitch atop a rotation.