According to the Associated Press and, Yankee closer Mariano Rivera underwent successful shoulder surgery:

New York Yankees closer Mariano Rivera had surgery Tuesday on his right shoulder and is expected to resume throwing in three months, a month ahead of spring training.

Altchek shaved a calcified joint on the top of Rivera's shoulder.

The term successful is a tough label to put on the surgery this early, as Yankee fans will want to see success translate into another dominant season by the Yankee closer.

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