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WBC/WBA 154-pound champion Canelo Alvarez punches at Floyd Mayweather Jr. of the U.S. in Las Vegas

WBC/WBA 154-pound champion Canelo Alvarez (L) punches at Floyd Mayweather Jr. of the U.S. at the MGM Grand Garden Arena in Las Vegas, Nevada, September 14, 2013. REUTERS/Steve Marcus (UNITED STATES - Tags: SPORT BOXING)

Floyd Mayweather Jr. vs. Canelo Alvarez