Mets' Matz impresses at Double-A

Steven Matz has refined his delivery and recovered from 2010 Tommy John surgery. Adam Rubin

The New York Mets took left-hander Steven Matz in the second round of the 2009 draft out of a Long Island high school, using their first pick that year on him. But Matz, who had a violent delivery and some elbow issues as an amateur, blew out his elbow almost immediately after signing and didn't pitch in a professional game until June of 2012. He made 21 starts last year, averaging just five innings per start and facing more than 22 batters in only one outing all season, but stayed healthy and had solid results.

This year, he's had a real breakout season, throwing harder with better control and strong enough results to move up to Double-A and become one of the team's top 10 prospects.