"Left-hander Steve Matz, the Mets’ top pick in the 2009 draft (second round, 72nd overall), has been backed off throwing because of suspected scar tissue where he had May 18, 2010 Tommy John surgery. Players generally work through scar tissue to break it up, but the Mets proceeded more cautiously with the 20-year-old southpaw, who is a product of Ward Melville High on Long Island. Farm director Adam Wogan said Matz is due to resume throwing Friday, when the extended spring training group returns from a three-day break. Matz, who has yet to throw a professional pitch in a game, will initially be assigned to the Gulf Coast League, not Brooklyn, according to Wogan."
The GCL season begins on June 21, so any further delays will mean he's likely to start a little late.