Mayweather Jr. of the U.S. celebrates his victory over Alvarez at the MGM Grand Garden Arena in Las Vegas

Floyd Mayweather Jr. of the U.S. celebrates his victory over WBC/WBA 154-pound champion Canelo Alvarez at the MGM Grand Garden Arena in Las Vegas, Nevada, September 14, 2013. Alvarez was previously undefeated in 42 fights. REUTERS/Steve Marcus (UNITED STATES – Tags: SPORT BOXING) – RTX13LSU