Roy Halladay underwent successful shoulder surgery, the Phillies said Thursday.

Phillies doctor Michael Ciccotti said Halladay on Wednesday “underwent debridement of his labrum and rotator cuff as well as removal of an inflamed bursa.”

Halladay will begin a progressive rehabilitation program. If that goes well, Halladay could begin a throwing program in six to eight weeks. That does not mean Halladay would be ready to pitch in the Major Leagues. He will need time to rebuild his arm strength.

Halladay has struggled much of this season. He is 2-4 with an 8.65 ERA. He gave nine running in a little more than two innings in his last appearance – a May 5 start against the Miami Marlins.

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