Floyd Mayweather Jr., left, lands a left on Oscar De La Hoya during the twelfth round of their WBC super welterweight world championship boxing match on Saturday, May 5, 2007, at the MGM Grand Garden Arena  in Las Vegas. (AP Photo/Kevork Djansezian)

Floyd Mayweather Jr., left, lands a left on Oscar De La Hoya during the twelfth round of their WBC super welterweight world championship boxing match on Saturday, May 5, 2007, at the MGM Grand Garden Arena in Las Vegas. (AP Photo/Kevork Djansezian)