Adam Kloffenstein

Most top prospects spent the summer at alternate training sites, but Kloffenstein took a road less traveled. He played indy ball in a four-team league in Texas -- the continent's highest level of organized baseball outside of MLB in 2020. At 19, he was the youngest player in the league by four years, often facing Triple-A and Quad-A hitters. His pitching coach was none other than the league's founder, Roger Clemens. He was limited to three-inning stints and logged almost a strikeout per inning while firing scoreless outings in five of his last eight appearances. Perhaps most importantly, Kloffenstein's five-pitch mix is now headlined by a four-seamer that touches 99 mph and a sinker that touches 97. The 6-foot-5, 245-pound righty's slider is a third plus pitch, and he's working on getting his curveball and changeup there as well. Harnessing his command will be his top priority in his full-season debut.