"The key to a comeback season, Jimmy Rollins has said numerous times this year, is simply staying on the field. After he left Sunday's game with a strained groin, it's unclear just when Rollins might be on the field again.

The 32-year-old shortstop was coming off an injury-ravaged 2010 campaign but had managed to play in all but four of the Phillies' games this season.

But Rollins left Sunday's game in the third inning after apparently hurting himself going after a ball in the hole in the bottom of the second inning.

Rollins will have an MRI this morning to determine the severity of the strain."