WBO welterweight champion boxer Manny Pacquiao, of the Philippines, left, poses for photos next to his challenger Juan Manuel Marquez, of Mexico, during a news conference in Mexico City, Friday, Sept. 21, 2012. The boxers are promoting their fourth fight, scheduled for Dec. 8, 2012 in Las Vegas. (AP Photo/Christian Palma)

Associated Press
WBO welterweight champion boxer Manny Pacquiao, of the Philippines, left, poses for photos next to his challenger Juan Manuel Marquez, of Mexico, during a news conference in Mexico City, Friday, Sept. 21, 2012. The boxers are promoting their fourth fight, scheduled for Dec. 8, 2012 in Las Vegas. (AP Photo/Christian Palma)
WBO welterweight champion boxer Manny Pacquiao, of the Philippines, left, poses for photos next to his challenger Juan Manuel Marquez, of Mexico, during a news conference in Mexico City, Friday, Sept. 21, 2012. The boxers are promoting their fourth fight, scheduled for Dec. 8, 2012 in Las Vegas. (AP Photo/Christian Palma)
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