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Floyd Mayeather Jr., right, shows promoters his hurt right hand after defeating Robert Guerrero during a WBC welterweight title fight, Saturday, May 4, 2013, in Las Vegas. (AP Photo/Isaac Brekken)

Associated Press
Floyd Mayeather Jr., right, shows promoters  his hurt right hand after defeating Robert Guerrero during a WBC welterweight title fight, Saturday, May 4, 2013, in Las Vegas. (AP Photo/Isaac Brekken)
Floyd Mayeather Jr., right, shows promoters his hurt right hand after defeating Robert Guerrero during a WBC welterweight title fight, Saturday, May 4, 2013, in Las Vegas. (AP Photo/Isaac Brekken)
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