Floyd Mayweather Jr. slams a right to the head of WBC Welterweight Champion Victor Ortiz in the 4th round as referee Joe Cortez looks on, ending the fight on September 17, 2011 at the MGM Grand Garden Arena in Las Vegas. Mayweather beat Ortiz in a knockout to win the WBC Welterweight title. AFP PHOTO/JOHN GURZINSKI (Photo credit should read JOHN GURZINSKI/AFP/Getty Images)