Beaten Pacquiao says hampered by shoulder injury

American boxer Floyd Mayweather (left) hugs Manny Pacquiao of the Philippines after Mayweather had won the welterweight title fight in Las Vegas on Sunday. - AFP

LAS VEGAS (Reuters) - Filipino Manny Pacquiao said a shoulder injury hampered his bid to hand Floyd Mayweather a first ever defeat as a professional on Saturday as the American improved his record to 48-0 with a unanimous decision.

Pacquiao, a 2-1 underdog going into the welterweight bout billed as the "Fight of the Century" at the MGM Grand Garden Arena, suffered the injury during a sparring session, according to his trainer Freddie Roach.