Manny Pacquiao - Juan Manuel Marquez IV

Associated Press
Referee Kenny Bayless calls the fight as he kneels over Manny Pacquiao, from the Philippines, after he was knocked out by Juan Manuel Marquez, from Mexico, during their WBO world welterweight  fight Saturday, Dec. 8, 2012, in Las Vegas. (AP Photo/Julie Jacobson)

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Manny Pacquiao was dropped by a vicious right hand by longtime rival Juan Manuel Marquez in the sixth round as the two fought for the fourth time at the MGM Grand Garden Arena in Las Vegas, Nev. on Saturday, Dec. 8, 2012.

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