Manager Joe Torre doesn't think it was coincidence that the reliever turned himself around in Colorado after allowing five runs over his previous three appearances, none longer than an inning.
"I probably feel best when I bring him in against [the Rockies]," Torre said. "Last year he had that four-inning save against them there. At that point, I think he sort of said, 'Look at me.' Sometimes that's what happens against certain teams, whether you're a hitter or a pitcher."
Troncoso has a 2.66 ERA in 20 1/3 innings against the Rockies in his career.
There has been some shuffling around Troncoso, Hong-Chih Kuo, Ronald Belisario and closer Jonathan Broxton in the bullpen. Travis Schlichting was recalled from Triple-A Albuquerque after Sunday's game, and left-hander Scott Elbert was sent down.
Meanwhile, starter Vicente Padilla, on the disabled list, is slated for another simulated game in the bullpen before making a rehab start, and reliever George Sherrill is halfway through his 15 days on the DL.