1983-09-21 Carlos De Leon w rsc 4 (12) Yaqui Lopez, Municipal Stadium, San Jose, California, USA - WBC
1983-09-21 Carlos De Leon w rsc 4 (12) Yaqui Lopez, Municipal Stadium, San Jose, California, USA - WBC. Referee: Henry Elesperu. Making a fast start, De Leon (188¾) had his 42-year-old challenger on the deck inside the opening 40 seconds, but then allowed him to recover. After outboxing Lopez in the second, De Leon was forced to defend in the third as the Mexican moved his attack to the body and that pattern continued into the fourth. With Lopez getting himself back in the fight, it all changed when a long left from De Leon opened up a bad cut over his right eye and after consulting with doctor the referee called it off at 2.51 of the fourth.
Back in April, the recently formed USBA/I had stated that they would recognise S.T.Gordon as champion, but following his defeat at the hands of De Leon the organisation agreed to recognise De Leon. However, in late October, the USBA/I, now reconstituted as the International Boxing Federation (IBF), announced that they would now be recognising Marvin Camel (who held the USBA title) as their champion as it had not been possible to induce De Leon to fight under their banner and nominated Roddy MacDonald as his first challenger.