Mayweather defeats Cotto in Vegas © REUTERS/Steve Marcus Floyd Mayweather has defeated Miguel Cotto in Las Vegas to add the WBA super-welterweight title to his trophy cabinet, following a unanimous points victory. Mayweather, fighting at the 154lbs limit for the first time since defeating Oscar De La Hoya to win the WBC belt five years ago, won by 118-110 and 117-111 (twice) on the judges' scorecards to reach an unblemished 43-fight record, maintaining his position as one of the greatest boxers of his generation. Cotto, unbeaten in his previous three bouts at light-middleweight, enjoyed moments of success, piling on brutal spells of inside pressure, but slips to 37 wins and three defeats as a professional. The fight was characterised by American Mayweather landing stiff jabs and fast right hands, whilst Puerto Rico's Cotto moved forward, forcing Mayweather to the ropes and digging into him with left hooks. Cotto looked strong and the constant pressure seemed to be taking its toll. In the sixth round, Mayweather returned to his corner with a bloody nose. However it was Mayweather who closed in style, rattling Cotto with combinations that buckled the champion's knees. Attention will now turn towards the prospect pairing Mayweather with pound-for-pound rival Manny Pacquiao, after he serves a three-month prison sentence after pleading guilty to a domestic violence charge.