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LAS VEGAS, NV - SEPTEMBER 12: Floyd Mayweather Jr. enters the ring prior to his WBC/WBA welterweight title fight against Andre Berto at MGM Grand Garden Arena on September 12, 2015 in Las Vegas, Nevada. (Photo by Ezra Shaw/Getty Images)

LAS VEGAS, NV - SEPTEMBER 12:  Floyd Mayweather Jr. enters the ring prior to his WBC/WBA welterweight title fight against Andre Berto at MGM Grand Garden Arena on September 12, 2015 in Las Vegas, Nevada.  (Photo by Ezra Shaw/Getty Images)