| Fight Date: | May 4, 2013 |
| Fight Name: | May Day |
| Location: | MGM Grand Garden Arena, Paradise, Nevada, U.S. |
| Fighter1: | Floyd Mayweather Jr. |
| Nickname1: | Money |
| Record1: | 43–0 (26 KO) |
| Hometown1: | Las Vegas, Nevada, U.S. |
| Age1: | 36 |
| Height1: | 5 ft 8 in |
| Weight1: | 146 lb |
| Style1: | Orthodox |
| Recognition1: | WBC welterweight champion WBA (Super) super welterweight champion The Ring No. 1 ranked pound-for-pound fighter 5-division world champion |
| Fighter2: | Robert Guerrero |
| Nickname2: | The Ghost |
| Record2: | 31–1–1–2 (18 KO) |
| Hometown2: | Gilroy, California, U.S. |
| Age2: | 30 |
| Height2: | 5 ft 8 in |
| Weight2: | 147 lb |
| Style2: | Southpaw |
| Recognition2: | WBC interim welterweight champion The Ring No. 8 ranked pound-for-pound fighter 2-division world champion |
| Titles: | WBC and vacant The Ring welterweight titles |
| Result: | Mayweather Jr. wins via 12-round unanimous decision (117-111, 117-111, 117-111) |
Floyd Mayweather Jr. vs. Robert Guerrero, billed as May Day, was a boxing welterweight championship superfight for Mayweather Jr.'s WBC welterweight title and vacant The Ring welterweight title.[1] The bout was held on May 4, 2013, in the MGM Grand Garden Arena at the MGM Grand Hotel & Casino in Las Vegas, Nevada, United States on Showtime PPV. The bout was the first major televised fight of Mayweather's career to not be aired on HBO PPV. The card featured some of the rising stars of Mayweather Promotions: J'Leon Love, Badou Jack, Luis Arias, Ronald Gavril and Lanell Bellows.[2] Mayweather won via unanimous decision with Guerrero winning the first 3 rounds, before Mayweather adjusted and won from the 4th to 12th round.
Mayweather's assistant trainer (his father) advised him onto a very defensive strategy, saying that "the less you get hit, the longer you last". This style of fighting elicited boos from the crowd especially during the 11th and 12th round when Floyd may have believed he had the score "locked up" already and didn't need to win any more rounds, saying that "When you're up on the cards, box smart."[3] [4] [5] [6]
Floyd Mayweather equaled his own all time base purse record with a guaranteed $32 million.[7] Robert Guerrero was guaranteed $3 million.[8]
| Weight Class | Result | Round | Time | Notes | ||||
|---|---|---|---|---|---|---|---|---|
| Welterweight |  Floyd Mayweather Jr. | def. | Robert Guerrero | Unanimous Decision | 12 | 3:00 | Championship bout. | |
| Featherweight |  Abner Mares | def. | Daniel Ponce De Leon | TKO | 9 | 2:20 | Championship bout. | |
| Super Bantamweight | Léo Santa Cruz | def. | Alexander Muñoz | TKO | 5 | 1:05 | ||
| Middleweight | J'Leon Love | vs. | Gabriel Rosado | No Contest | 10 | 3:00 | ||
| Super Middleweight |  Ronald Gavril | def. | Roberto Yong | TKO | 3 | 2:12 | ||
| Super Middleweight | Lanell Bellows | def. | Matt Garretson | TKO | 4 | 0:32 | ||
| Super Middleweight | Luis Arias | def. | DonYil Livingston | Majority Decision | 6 | 3:00 | ||
| Light Heavyweight |  Badou Jack | def. |  Michael Gbenga | TKO | 3 | 2:26 | ||
† 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. The last AKTV sports block before its shut down on May 31, 2013.