Manny Pacquiao - Juan Manuel Marquez IV

Associated Press
Referee Kenny Bayless, left, calls the fight as Juan Manuel Marquez, from Mexico, right, celebrates after he knocked out Manny Pacquiao, from the Philippines, lower left, in the sixth round of their WBO world welterweight  fight Saturday, Dec. 8, 2012, in Las Vegas. (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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