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A 6-foot-4, 216-pound righthander, Zeferjahn has some of the best pure stuff in the 2019 draft class between a fastball that gets into the upper 90s and a mid-80s power slider that gives him a second plus offering. Part of a loaded 2016 Kansas prep class that also included Riley Pint and Joey Wentz, Zeferjahn showed plenty of potential as a hard-throwing high schooler at the time and has filled out his frame over his two years with Kansas. He has also showcased more consistency out of his slider recently. Still, evaluators are less impressed with his strike-throwing ability—he’s walked five batters per nine innings over 132 innings—and want to see him take a step forward during the spring before they consider him no-doubt Day 1 pick. The potential and stuff is there, but he’ll need to put together a respectable junior campaign with the Jayhawks before that happens.