Whom did Ron Lyle and Oscar Bonavena both box?
Oscar Bonavena Oscar Natalio "Ringo" Bonavena (September 25, 1942 – May 22, 1976) was an Argentinian heavyweight professional boxer with a career record of 58 wins, 9 losses and 1 draw. A rugged, wild-swinging puncher, he was nicknamed "Ringo" because of his Beatles haircut, and enjoyed professional success in both Argentina and the United States. He is most famous for giving both Joe Frazier and Muhammad Ali tough battles.
Rigoberto Riasco Rigoberto Riasco (born January 11, 1953) also known as "Little Poison", was a Panamanian professional boxer who competed from 1968 to 1982. He was the Lineal and WBC Super bantamweight champion in 1976. Riasco defeated such men as Dong Kyun Yum, Leonel Hernandez, Rafael Ortega, Waruinge Nakayama, Luis Avila, Santos Luis Rivera, Seiji "Flipper" Uehara and Sanjo Takemori.