Manny Pacquiao - Juan Manuel Marquez IV

Associated Press
Juan Manuel Marquez, from Mexico celebrates his win over Manny Pacquiao in 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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