Juan Manuel Marquez, from Mexico, celebrates his sixth round knockout victory over 

Juan Manuel Marquez, from Mexico, celebrates his sixth round knockout victory over Manny Pacquiao, from the Philippines, in their WBO world welterweight  fight Saturday, Dec. 8, 2012, in Las Vegas.  (AP Photo/Julie Jacobson)
Associated Press
Juan Manuel Marquez, from Mexico, celebrates his sixth round knockout victory over Manny Pacquiao, from the Philippines, in their WBO world welterweight fight Saturday, Dec. 8, 2012, in Las Vegas. (AP Photo/Julie Jacobson)
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