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)

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)
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)
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