Floyd Mayweather Jr. vs. Robert Guerrero, billed as May Day, was a professional boxing match contested on May 4, 2013, for the WBC and vacant The Ring welterweight championship.

[1][2] Since moving up to Light middleweight to successfully challenge Miguel Cotto in May 2012, Floyd Mayweather Jr. had spent two months in jail for domestic abuse.

[3][4] In the meantime Robert Guerrero had defeated Selçuk Aydın to become the WBC's "interim" welterweight champion in July 2012,[5] and in November he defended it by winning a unanimous decision over Andre Berto.

The card featured some of the rising stars of Mayweather Promotions: J'Leon Love, Badou Jack, Luis Arias, Ronald Gavril and Lanell Bellows.

[18] Confirmed bouts:[19] † The GMA News TV version cancelled due to low ratings of Floyd Mayweather Jr. vs. Robert Guerrero, billed as May Day †† AKTV on IBC coverage have stopped airing due to high blocktime costs of Mayweather-Guerrero fight during primetime telecast.