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LAS VEGAS, NV - SEPTEMBER 12: Floyd Mayweather Jr. (R) throws a right at Andre Berto in the eighth 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)

LAS VEGAS, NV - SEPTEMBER 12:  Floyd Mayweather Jr. (R) throws a right at Andre Berto in the eighth 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)