Floyd Mayweather Jr. beats Robert Guerrero, remains undefeated

LAS VEGAS, NV - MAY 04: (R-L) Robert Guerrero throws a punch to the chest of Floyd Mayweather Jr. in their WBC welterweight title bout at the MGM Grand Garden Arena on May 4, 2013 in Las Vegas, Nevada. (Photo by Al Bello/Getty Images)

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