Juan Manuel Marquez, from Mexico, right, knocks out Manny Pacquiao, from the Philippines, in the sixth round of their WBO world welterweight fight Saturday, Dec. 8, 2012, in Las Vegas. Referee Kenny Bayless looks on at left rear. (AP Photo/Julie Jacobson)

Associated Press
Juan Manuel Marquez, from Mexico, right, knocks out Manny Pacquiao, from the Philippines, in the sixth round of their WBO world welterweight  fight Saturday, Dec. 8, 2012, in Las Vegas. Referee Kenny Bayless looks on at left rear.  (AP Photo/Julie Jacobson)
Juan Manuel Marquez, from Mexico, right, knocks out Manny Pacquiao, from the Philippines, in the sixth round of their WBO world welterweight fight Saturday, Dec. 8, 2012, in Las Vegas. Referee Kenny Bayless looks on at left rear. (AP Photo/Julie Jacobson)
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