WBO welterweight champion boxer Manny Pacquiao, of the Philippines, waves as fireworks explode behind him during a boxing presentation in Mexico City, Friday, Sept. 21, 2012. Pacquiao and his Mexican ... more 

WBO welterweight champion boxer Manny Pacquiao, of the Philippines, waves as fireworks explode behind him during a boxing presentation in Mexico City, Friday, Sept. 21, 2012. Pacquiao and his Mexican challenger Juan Manuel Marquez are promoting their fourth fight, scheduled for Dec. 8, 2012 in Las Vegas. (AP Photo/Christian Palma) less