After his fight with De La Hoya Mayweather decided to relinquish his WBC light-middleweight championship, retaining his welterweight title. On July 28, 2007, it was announced that Mayweather would come out of his brief retirement to fight The Ring light welterweight champion Ricky Hatton; the bout was promoted by De La Hoya’s promotion company (Golden Boy Promotions) and Mayweather’s Mayweather Promotions. The fight was entitled “Undefeated”; it took place December 8, 2007 at the MGM Grand Garden Arena, Las Vegas, Nevada, the biggest welterweight showdown between two undefeated fighters since De La Hoya met Félix Trinidad in 1999. During the run-up to their fight Mayweather claimed he was the greatest boxer ever: “I respect what Robinson and Ali did for the sport. But I am the greatest and this is my time.”
Mayweather controlled the fight from the beginning, knocking Hatton out in the 10th round to retain the welterweight championship. Hatton suffered a cut over his right eye in round three; from that point, his pace and movement began to slow. In round six, Hatton lost a point for punching the back of Mayweather’s head as he was draped over the ropes. During the tenth round, Hatton was caught by a checked left hook thrown from Mayweather’s hip; after falling headfirst into the turnbuckle, he hit the floor. Hatton made it to his feet, but was dazed. Two more lefts in quick succession knocked Hatton down again, and referee Cortez stopped the fight at 1:35 of round ten. Official scorecards read 88–82, 89–81 and 89–81 at the time of stoppage, all in favor of Mayweather.
After the fight, Mayweather said that Hatton was one of his toughest, most tenacious opponents. Mayweather announced his retirement from boxing to concentrate on his promotional company, saying he wanted Hatton to be his first client.