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It might have been the toughest $32 million Floyd Mayweather Jr. ever made.

Marcos Maidana did everything Saturday night but beat Mayweather, taking him 12 tough rounds before losing a majority decision.

Mayweather remained unbeaten, but not by much. Maidana swarmed all over him from the opening bell and gave him perhaps his toughest fight in a 16-year professional career.

Cut over his eye and temporarily blinded by a head butt in the fourth round, Mayweather had to rally in the last half of the fight to avoid losing for the first time since he was beaten on a controversial decision in the 1996 Olympics.

In the end, though, Mayweather got the win - just as he did in his previous 45 fights in a decision that was met with disbelief by Maidana and booed heavily by the crowd. He retained his welterweight title by winning 117-111 on one scorecard and 116-112 on another. A third judge had it even at 114-114.

The Associated Press scored it for Mayweather 115-113.