Floyd Mayweather Jr. vs. Robert Guerrero
2013-05-04 : Floyd Mayweather Jr 146 lbs beat Robert Guerrero 147 lbs by UD in round 12 of 12
- Location: MGM Grand, Grand Garden Arena, Las Vegas, Nevada, USA
- Referee: Robert Byrd
- Judge: Jerry Roth 117-111
- Judge: Duane Ford 117-111
- Judge: Julie Lederman 117-111
- Ring Announcer: Jimmy Lennon Jr.
- Aired On: Showtime Pay-Per-View (Main Event)
- World Boxing Council Welterweight Title (1st defense in 2nd reign by Mayweather Jr.)
- The Ring Magazine Welterweight Title (vacant)
In the main event of Showtime's pay-per-view card at MGM Grand in Las Vegas, Nevada, the 36-year-old Mayweather Jr. proved yet again that his skills are indeed intact and his place atop the world's pound-for-pound rankings is valid, as he cruised to his 44th win against an outmatched but game Robert Guerrero (31-1-1).
The champion was simply too quick defensively and too fast-handed, as round after round Mayweather stuck Guerrero with lead right hands and left the Californian missing and with little opportunity to build any momentum.
"That's why he's undefeated." Guerrero said. "He was a little better than I thought.He was barely slipping away from the punches. I thought I'd catch him."
The eighth round was the strongest for Mayweather Jr. Midway through a punch opened a cut above his opponent's left eye and by the end of the round, Guerrero was clearly hurt and bloodied.
Much of the same continued for the remainder of the bout, with Guerrero pressing forward, but being caught with clean punches while being unable to land. He showed a good chin and had some opportunities, but never could connect with the big punch and Mayweather usually tied him up on the inside.
Mayweather Jr. (44-0) apologized to the crowd after the fight for being unable to deliver the knockout he had hoped for, but revealed a swollen right hand that he said he injured midway through the fight. The injury, he said, forced him to box more in the second half rather than go for a knockout.
"I take my hat off to Robert Guerrero." Mayweather said. "He's a true warrior. It was blood, sweat and tears in there tonight, what can I say. Everybody was saying, at age 36, that I wasn't as sharp as I used to be, that I didn't look good in the Cotto fight. But Cotto is a future hall of famer and a great fighter. Guerrero was pressing the attack, but I had good work for this fight.”
- Floyd Mayweather Jr. 43-0 (26 KOs) vs. Robert Guerrero 31-1-1 (18 KOs)
- Mayweather Jr. entered as the # 1 welterweight contender and #1 pound-for-pound boxer in the world according to The Ring Magazine. Guerrero, a 5-to-1 betting underdog, was ranked as the # 3 welterweight contender by the same publication. In winning the fight, Mayweather reclaimed the same Ring title he gave up nearly five years ago, when he temporarily retired in June 2008.  
- It was the 21st world-title fight for Mayweather Jr.
- Mayweather Jr. claimed the WBC welterweight title for the second time in September of 2011 with his knockout win over Victor Ortiz (29-2-2). Guerrero held the interim-WBC welterweight title at the time of this fight.
- Mayweather's contract, filed the day prior to the fight with the Nevada State Athletic Commission, called for him to earn a record-tying guarantee of $32 million. Guerrero reportedly earned $3 million for the fight. Mayweather's purse tied the all-time record for the largest single-fight contract in history, which he set in May of 2012 for his win against Cotto.  
- The fight was part of a six-fight deal Mayweather signed with Showtime, ending a 23-fight streak with HBO. 
- Mayweather announced on Valentine's Day that his father, Floyd Mayweather, would train him for the fight. 
- The fight was a return by Mayweather Jr. to welterweight. In his previous fight, he defeated Miguel Cotto (37-2) at junior middleweight.
- Mayweather held a rematch clause in his contract if he wanted to use it. Guerrero did not have a rematch clause.
- As a build up to the fight, Showtime aired a 60-minute documentary "30 Days In May" and "All Access" which chronicled the month leading up to the fight.
- The price of the pay-per-view was $59.95 for standard definition and $69.95 for high definition.
- It was the 10th overall and 7th consecutive fight for Mayweather Jr. at the MGM Grand in Las Vegas, Nevada. It was Guerrero's second appearance at the venue. In his previous fight there in April of 2011, he scored a unanimous decision over Michael Katsidis (27-3).
- On March 28th, Guerrero was arrested at John F Kennedy International Airport and charged with illegally traveling with a .40 caliber Smith and Wesson semi-automatic handgun and three high capacity unloaded magazines. Gerrero, allegedly, declared the gun was in luggage he planned to check for his 8:10 a.m. Although the gun was unloaded, he was arrested for violating New York’s gun possession laws which require the firearm be licensed in the state of New York regardless if licensed elsewhere. 
- It was the first fight for Mayweather Jr. since serving a two-month jail sentence in the summer of 2012 for a domestic violence charge brought by his longtime girlfriend and mother of his children from a 2010 incident. This was further spotlighted by Guerrero's father, Ruben, referring to both Mayweather Jr. and Mayweather Sr. as "woman beaters" at the final pre-fight press conference and declaring, "We're going to beat that woman beater down."
- Among the around 19,000 which were in attendance were Evander Holyfield, Oscar De La Hoya, Bernard Hopkins, Miguel Cotto, Danny Garcia, Austin Trout, Victor Ortiz, Amir Khan, Andre Berto, rapper Sean "Puff Daddy" Combs, and the NBA's Rajon Rondo.
- Mayweather Jr. wore gold trunks with black trim and was escorted to the ring by rapper Lil' Wayne. Guerrero wore red trucks with white trim and came to the ring wearing a t-shirt which read "God Is Great".
-  Recap of the entire card, including Floyd Mayweather Jr. vs. Robert Guerrero, on Queensberry Rules Radio, featuring James Foley, Patrick Connor and Jimmy Tobin