Guerra was placed on the disabled list Monday with an injury believed to be sustained when he was struck by a Brian McCann line drive in the jaw on April 25. After contact, Guerra spun toward his right and his spikes might have stuck in the ground while he twisted his knee. He remained in the game, suffered a blown save and two weeks later lost the closer's job to Kenley Jansen.
"Sue said the doc was happy with it," manager Don Mattingly said, referring to trainer Sue Falsone. "There wasn't any other damage. He'll be back playing catch quick. A few days and he'll be throwing again."
Guerra was the surprise of the bullpen last year, called up from Double-A in May and inheriting the closer's job from a struggling and injured Jonathan Broxton. Guerra saved 21 games as a rookie with a 2.31 ERA.
But even before his injury this season he was hit harder and more often than last year. Guerra was a fourth-round Draft pick in 2004 who overcame Tommy John surgery in the Minor Leagues.