1991-03-18 Julio Cesar Chavez w rsc 4 John Duplessis, Mirage Hotel & Casino, Las Vegas, Nevada, USA - IBF/WBC
1991-03-18 Julio Cesar Chavez w rsc 4 John Duplessis, Mirage Hotel & Casino, Las Vegas, Nevada, USA - IBF/WBC. Referee: Carlos Padilla. Deciding that he was not going to trade punches with the champion, Duplessis (139) quickly got on his bike while throwing out ineffectual lefts, and after surviving the opening round continued in much the same vein. However, Chavez (139) was not a champion for nothing and he was soon closing the ring space down. With Duplessis now dropping the jab well short before scampering away, just before the end of the second a right-left to the jaw followed by a left hook to the body put him down for ‘four’ after Chavez had been surprised by a solid right to the head. It was more of the same in the third as Duplessis moved at pace, but after he was doubled up by a left hook to the body in the fourth the writing was firmly on the wall. Timing his attack perfectly Chavez pounced, and having driven Duplessis into a corner with a big right to the head a right to the body sent him halfway through the ropes, whereupon the referee called it off. The finish was timed at 2.42.
When Chavez relinquished the IBF version of the title in April 1991 rather than defend against Rafael Pineda on a Bob Arum promotion, the latter was matched against Roger Mayweather to find a new champion.