Troncoso became a workhorse of then-manager Joe Torre's staff in 2009, throwing 82 2/3 innings with a 2.72 ERA. But he regressed last year and was ineffective in a 12-game big-league stint this year, compiling a 6.23 ERA while allowing as many home runs (three) in 17 1/3 innings as he did for all of 2009.
It hadn't gone much better for Troncoso at Albuquerque, where he had a 5.05 ERA in 57 innings.
"Last year, his ball wasn't sinking," manager Don Mattingly said of Troncoso. "It was flat. And he fell in love with his curveball. He still has a chance to be valuable. He's really durable, can pitch on multiple days. But guys figure you out when you can't throw strikes down there. The consistency just hasn't been there. You like guys where you know what you're going to get."
Ken Gurnick is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.