Oscar Rivadeneira
Encyclopedia
Oscar Rivadeneira was a Peruvian boxer
Boxing
Boxing, also called pugilism, is a combat sport in which two people fight each other using their fists. Boxing is supervised by a referee over a series of between one to three minute intervals called rounds...

, who fought with Michael Spinks
Michael Spinks
Michael Spinks is a retired American boxer who was a world champion in the light-heavyweight and heavyweight divisions...

 in 1983 for the Light Heavyweight
Light heavyweight
In boxing, the light heavyweight is a weight division above 168 pounds [12 Stone or 76.204 kilograms] and up to 175 pounds [12.5 stone or 79.38 kilograms]), falling between super middleweight and cruiserweight...

 championship. He was beaten in a tenth round knockout
Knockout
A knockout is a fight-ending, winning criterion in several full-contact combat sports, such as boxing, kickboxing, Muay Thai, mixed martial arts, Karate and others sports involving striking...

.
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