Juan Manuel Marquez, from Mexico, right, connects against Manny Pacquiao, from the Philippines, as referee Kenny Bayless looks on at left, during their WBO world welterweight fight Saturday, Dec. 8, 2012, in Las Vegas. Marquez won the fight by a knockout. (AP Photo/Julie Jacobson)

Juan Manuel Marquez, from Mexico, right, connects against Manny Pacquiao, from the Philippines, as referee Kenny Bayless looks on at left, during their WBO world welterweight fight Saturday, Dec. 8, 2012, in Las Vegas. Marquez won the fight by a knockout. (AP Photo/Julie Jacobson)

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