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SAN FRANCISCO, CA - Pablo Sandoval has a broken bone in his left hand that will require surgery, and the San Francisco slugger is expected to miss four to six weeks.

The free-swinging switch-hitter broke his right hamate bone in late April last year and had surgery, then it happened again to the other hand in recent days and he aggravated it swinging left-handed in Wednesday's 3-2, 10-inning loss to the Marlins and had to leave the game.

An X-ray Tuesday did not reveal the break, but Sandoval then underwent an MRI exam and CT scan that showed the fracture. He will undergo surgery Friday at Stanford, performed by Dr. Tim McAdams.

The Giants' top hitter and 2011 All-Star needed the full six weeks last year for his throwing hand to recover.

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