LAS VEGAS, NV - SEPTEMBER 13:  Boxer Floyd Mayweather Jr. poses on the scale during the official weigh-in for his bout against Canelo Alvarez at the MGM Grand Garden Arena on September 13, 2013 in Las Vegas, Nevada. The fighters will meet in a WBC/WBA 154-pound title fight on September 14 in Las Vegas.  (Photo by Ethan Miller/Getty Images)