While he was in the WWWF, Morales was the first male wrestler in wrestling history to win all three of the major men's titles in the company. He won the WWWF Championship, the Intercontinental Championship, and the WWF World Tag Team Championship. When he won the WWWF United States Championship, Morales became the first wrestler to hold four different titles within the promotion, a distinction which would later became known as a Grand Slam Championship.