Watching Roy Halladay leave his start early on Sunday had Philadelphia Phillies fans wondering what could be wrong with their ace, but those on the coaching staff knew exactly what was going on, according to CSNPhilly.com.

Pitching coach Rich Dubee says Halladay's shoulder has been an issue before.

"Yeah, it's been an issue," Dubee said. "It's been there. It's been lingering. Some days it's better than others. Chicago [May 17] was better than others. Even the start of last game it was better and then got it cranky. Today, warming up, he felt fine, but as he got into the game and sat down and even before the first inning, it was just hard to get it going again."

It has yet to be determined if Halladay will get an MRI on his shoulder. Halladay leads the National League in batters faced this season.

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