Manny Pacquiao - Juan Manuel Marquez IV

Associated Press
Referee Kenny Bayless, left, directs Juan Manuel Marquez, right, to a corner as Manny Pacquiao sits on the mat after being knocked down by Marquez in the third round during a welterweight fight, Saturday, Dec. 8, 2012, in Las Vegas. Marquez knocked out Pacquiao in the sixth round to win their fourth bout. (AP Photo/Julie Jacobson)

View gallery

38 photos

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.

View Comments (0)