Floyd Mayweather Jr. celebrates after defeating Shane Mosley by unanimous decision in their WBA welterweight fight at the MGM Grand Garden Arena on Saturday night. (Ethan Miller / Getty Images)
Shane Mosley recoils after Floyd Mayweather Jr. lands a right to his head in their welterweight bout on Saturday night in Las Vegas. (Jed Jacobsohn / Getty Images)
Referee Kenny Bayless looks over at Shane Mosley as he gets between Mosley and Floyd Mayweather Jr. during their welterweight fight at the MGM Grand Garden Arena on Saturday night. (Ethan Miller / Getty Images)
Trainer Naazim Richardson, left, talks with Shane Mosley between rounds during the WBA welterweight boxing match against Floyd Mayweather Jr. on Saturday night in Las Vegas. (Mark J. Terrill / AP Photo)
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Floyd Mayweather Jr. catches his breath between rounds in his WBA welterweight fight against Shane Mosley on Saturday night in Las Vegas. (Mark J. Terril / AP Photo)
Floyd Mayweather Jr. and Shane Mosley exchange blows during their welterweight fight at the MGM Grand Garden Arena on Saturday night in Las Vegas. (Jed Jacobsohn / Getty Images)
Shane Mosley, a 38-year-old from Pomona, lands a right to the head of Floyd Mayweather Jr. during the welterweight bout on Saturday night in Las Vegas. (Jed Jacobsohn / Getty Images)
Floyd Mayweather Jr. lands a right uppercut to the sternum of Shane Mosley on Saturday night during their WBA welterweight boxing match in Las Vegas. (Jae C. Hong / Associated Press)
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Floyd Mayweather Jr, right, lands a blow to the head of Shane Mosley as they go toe to toe in their welterweight fight Saturday night in Las Vegas. (Ethan Miller / Getty Images)
Boxing legend Muhammad Ali acknowledges the crowd before the fight between Floyd Mayweather Jr. and Shane Mosley on Saturday night at the MGM Grand Garden Arena in Las Vegas. (Mark J. Terrill / Associated Press)
Actor Michael J. Fox, left, and legendary boxer Oscar De La Hoya chat before the WBA welterweight fight between Floyd Mayweather Jr. and Shane Mosley on Saturday night in Las Vegas. (Mark J. Terrill / Associated Press)
California Gov. Arnold Schwarzenegger takes in the Mayweather-Mosley fight with his family (from left): daughter Christina, wife Maria Shriver and son Patrick. (Mark J. Terrill / Associated Press)
