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.