LOS ANGELES — Manny Pacquiao will undergo surgery this week for a torn rotator cuff, with the recovery time expected to put the Filipino out of action for nine to 12 months, ESPN.com said on Monday.Pacquiao claimed a shoulder injury hampered his bid to hand Floyd Mayweather his first loss as a professional in the richest fight in boxing history at the MGM Grand Garden Arena in Las Vegas on Saturday.Mayweather won a unanimous decision in the four-belt unification bout to improve his record to 48-0.The injury would appear to rule out any chance of a rematch after the 38-year-old Mayweather said he would have one more fight in September before retiring."We have an MRI scan that confirms he has a rotator cuff tear. He has a significant tear," orthopedic surgeon Neal ElAttrache told ESPN.com.Pacquiao (57-6-2, 38 KOs), known for his aggressive and all-out attacking style, was clearly not his typical offensive-minded self in Las Vegas.After the fight, Top Rank promoter Bob Arum said Pacqui...

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