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06/30/08 11:38 PM ET

Guardado aggravates left shoulder

Rangers reliever exits during warmups before eighth inning

NEW YORK -- Rangers reliever Eddie Guardado had to leave Monday's 2-1 victory against the Yankees in the eighth inning because of inflammation in his left shoulder.

Guardado never threw a pitch in the game. Instead, the shoulder started growling at him while he was warming up on the mound, and he decided not to push it. It's the same problem that put him on the disabled list in April, but the Rangers' initial feeling is it's not as serious.

"He felt a twinge in his shoulder and didn't want to take any chances," manager Ron Washington said. "He's day-to-day, and we'll see how it goes. We don't think it's too bad. He's had this before. Sometimes it's one day, sometimes it's a couple of days. We'll see tomorrow."

Guardado is 1-1 with a 3.38 ERA in 33 games this season.

T.R. Sullivan is a reporter for MLB.com. This story was not subject to the approval of Major League Baseball or its clubs.