Undefeated American Floyd Mayweather won the World Boxing Association super welterweight title with a unanimous 12-round decision over Miguel Cotto Saturday at the MGM Grand.
Mayweather, who stepped up in weight to fight Cotto, used his superior hand speed and solid defence to win the fight on all three judges' scorecards.
Cotto, of Puerto Rico, made Mayweather work for the victory as he won some of the middle rounds and showed a willingness to engage Mayweather in the centre of the ring.
Mayweather ultimately survived one of the toughest fights of his career to extend his winning streak to 43-0 with 26 knockouts.
The fighters exchanged vicious punches in the 12th round with Mayweather landing the better of the shots. He appeared to wobble Cotto twice but couldn't knock him down.