A big lefty from Boston College, Arizona's Mike Belfiore was selected 45th overall by the Diamondbacks in 2009. A closer and first baseman in college, he combines easy heat with a plus slider: the perfect combination for a relief pitcher. While his big body and strong bat could play in the field, the Diamondbacks looked at Belfiore as a starting pitcher first, and so far they're sticking to that. Belfiore posted a 3.99 ERA in 25 starts for A-level South Bend in 2010, but slid to earth in 2011, with an ERA of 5.92 in 79 innings, most of them from the bullpen. This might be seen as a step back, but as long as he keeps up his strikeout rate (an even one per inning), he's got a bright future somewhere on a major league roster.