LAS VEGAS, NV – SEPTEMBER 12: (L-R) Referee Kenny Bayless separates Andre Berto and Floyd Mayweather Jr. during the seventh round of their WBC/WBA welterweight title fight at MGM Grand Garden Arena on September 12, 2015 in Las Vegas, Nevada. Mayweather retained his titles with a unanimous-decision victory. (Photo by Ethan Miller/Getty Images)