 Martínez had been the betting favorite in the bout, due partly to his previous victory over former WBC world champion Rolando Navarette in a non-title bout.On April 19, 1985, Chávez defended his title against number one ranked contender Ruben Castillo (63-4-2) by knocking him out in the sixth round.On July 7, 1985, Chavez defeated former and future champion Roger Mayweather via a second-round knockout.