Juan Manuel Marquez, from Mexico, right, lands a right to the head 

Juan Manuel Marquez, from Mexico, right, lands a right to the head of Manny Pacquiao, from the Philippines, during their WBO world welterweight  fight Saturday, Dec. 8, 2012, in Las Vegas. Marquez won by a knockout. (AP Photo/Julie Jacobson)
Associated Press
Juan Manuel Marquez, from Mexico, right, lands a right to the head of Manny Pacquiao, from the Philippines, during their WBO world welterweight fight Saturday, Dec. 8, 2012, in Las Vegas. Marquez won by a knockout. (AP Photo/Julie Jacobson)
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