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Mayweather Jr. punches at Maidana during their WBC/WBA welterweight unification fight at the MGM Grand Garden Arena in Las Vegas

Floyd Mayweather Jr. (L) of the U.S. punches at Marcos Maidana of Argentina during their WBC/WBA welterweight unification fight at the MGM Grand Garden Arena in Las Vegas, Nevada, May 3, 2014. REUTERS/Steve Marcus (UNITED STATES - Tags: SPORT BOXING)