NO! as of yet Floyd mayweather jr has not lost a professional boxing bout.
Floyd Mayweather won the boxing match on 9/13/2014. He wom with a unanimous decision by the judges.
Floyd Mayweather v Oscar De La Hoya
Money Mayweather won it on points. Sorry for the lateness of this answer as you would know the result by not.
Floyd Mayweather Jr. vs. Miguel Cotto boxing match took place on May 5, 2012.
Floyd by knockout :.(
Of course not. No match in WWE is.
against marquez, he got 15 million dollars plus a share of the gate and ppv buys.
rocky marciano and Floyd Mayweather Jr.
De La Hoya v. Mayweather
The Floyd Mayweather vs. Logan Paul fight is over. Given it was an exhibition, no winner was declared, but Floyd mostly did what he wanted, with an increasingly tired Logan Paul doing his best work in clinch positions.