Chandler Simpson: Promoted by the Tampa Bay Rays, Simpson is a base-stealing sensation. His minor league record is remarkable. His plate approach sets him apart. Jonathan Aranda: Off to a hot start, Aranda is shaping up as a key player for the Rays. Ben Rice: Strong power metrics make Rice a force for the Yankees. Justin Martinez: A stellar closer for the Arizona Diamondbacks. David Festa: A promising young pitcher for the Minnesota Twins. Austin Hays: Hitting well since returning from injury. Nick Kurtz: A speculative add with potential for the Athletics.