Mayweather Jr. punches at Guerrero during their title fight at the MGM Grand Garden Arena in Las Vegas

 
Mayweather Jr. punches at Guerrero during their title fight at the MGM Grand Garden Arena in Las Vegas
WBC welterweight champion Floyd Mayweather Jr. (L) of the U.S. punches at Robert Guerrero, also of the U.S., during their title fight at the MGM Grand Garden Arena in Las Vegas, Nevada May 4, 2013. REUTERS/Steve Marcus (UNITED STATES - Tags: SPORT BOXING)