It was announced that on May 1, 2010, Mosley would fight undefeated Floyd Mayweather Jr. Boxing purists had called for the fight for over ten years. Mosley was scheduled to fight WBC champion Andre Berto in a unification fight, but Berto had to pull out after an Earthquake in Haiti killed some of his family members. Mosley's WBA title was not on the line because Mayweather refused to pay WBA sanctioning fees. On the fight night, Mosley stunned Mayweather with two right-hand shots in the second round. Mayweather recovered well and dominated the remainder of the fight with superior reflexes and his effective counter-punching style, eventually beating Mosley in a wide decision 119–109, 119–109, and 118–110 on the scorecards to win Mosley's lineal'' welterweight championship.
it was announced that on may 1 2010 mosley would fight undefeated floyd mayweather jr boxing purists had called for the fight for over ten years mosley was scheduled to fight wbc champion andre berto in a unification fight but berto had to pull out after an earthquake in haiti killed some of his family members mosley's wba title was not on the line because mayweather refused to pay wba sanctioning fees on the fight night mosley stunned mayweather with two right-hand shots in the second round mayweather recovered well and dominated the remainder of the fight with superior reflexes and his effective counter-punching style eventually beating mosley in a wide decision 119–109 119–109 and 118–110 on the scorecards to win mosley's lineal'' welterweight championship