Floyd “Money” Mayweather (48-0, 26 KOs) opened up the Mayweather Boxing Club on Wednesday for his last media day ever as he prepares for the last fight of a celebrated 19-year career. He will defend his WBC and WBA Welterweight World Championships against power-punching, two-time welterweight world champion Andre Berto (30-3, 23 KOs) on Saturday, Sept. 12 at the MGM Grand Garden Arena in Las Vegas