Brad Lidge's knee turned out to be serious enough for surgery:

Phillies closer Brad Lidge is scheduled to have arthroscopic surgery on his right knee Monday and could miss the regular-season opener.

Lidge, Philadelphia's biggest offseason acquisition, limped off the field Saturday after injuring his knee when he caught a spike in the mound on his first pitch of batting practice. Doctors removed torn cartilage from the same knee in October.

The 31-year-old right-hander was expected to return to Philadelphia on Sunday for surgery Monday that would sideline him for three to six weeks. The Phillies open the season at home March 31 against Washington.

I assume this puts Tom Gordon in the closer role until Lidge comes back. I don't think they'll move Myers out of the rotation at this point.