12. Pittsburgh Pirates: J.B. Bukauskas, RHP, North Carolina

Texas high school righty Shane Baz and several position players have been linked here as well, but if Bukauskas slips outside the top 10, the Bucs could stop his fall. Though he's only 6', 195 pounds, he’s viewed as having the best pure stuff among college pitchers, with a 94-97 mph fastball and a mid-80s slider that both grade out as plus or plus-plus, depending upon whom you ask; Callis called his slider "the most unhittable pitch in the draft." There's concern about the lack of plane on his fastball, as well as a high-effort delivery that doesn't make use of his lower body, so there's a chance he becomes a late-inning reliever.