1982-05-22 Alexis Arguello w co 5 (15) Andy Ganigan, Aladdin Hotel, Las Vegas, Nevada, USA - WBC
1982-05-22 Alexis Arguello w co 5 (15) Andy Ganigan, Aladdin Hotel, Las Vegas, Nevada, USA - WBC. Referee: Carlos Padilla. Making a shocking start, Arguello (133¾) was caught completely cold and dropped by a left hook in the opening session before being in even more trouble before the bell rang. It looked like being a major upset, but after boxing his way out of further trouble the champion went on to floor Ganigan (135) in the third only for the latter to come roaring back with heavy rights and lefts which left him badly stunned. But like all great fighters when they are hurt, Arguello sensibly boxed his way back again prior to unloading a right-left to the head which smashed Ganigan to the floor, where he was counted out nine seconds after the bell to end round five.
Later in the year, the WBA announced that, as from 1 January 1983, all world title bouts held under their auspices would be contested over 12 rounds.
Arguello relinquished the WBC version of the title in February 1983 after becoming the WBA junior welterweight champion.