Manny Pacquiao - Juan Manuel Marquez IV

Associated Press
Referee Kenny Bayless, center, sends Juan Manuel Marquez, from Mexico, right, to his corner after Marquez knocked out Manny Pacquiao, from the Philippines, left, in the sixth inning of their WBO world welterweight  fight Saturday, Dec. 8, 2012, in Las Vegas. Marquez won the fight by a knockout.  (AP Photo/Eric Jamison)

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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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