Muhammad Ali 21 during an elimination bout following Rocky Marciano's retirement. Mike Tyson broke both records in 1986 when he defeated Trevor Berbick to win the heavyweight title at age 20. Soon after the Liston fight, Clay changed his name to Cassius X, and then later to Muhammad Ali upon converting to Islam and affiliating with the Nation of Islam. Ali then faced a rematch with Liston scheduled for May 1965 in Lewiston, Maine. It had been scheduled for Boston the previous November, but was postponed for six months due to Ali's emergency surgery for a hernia three days before. The fight
Muhammad Ali vs. Oscar Bonavena After the fight, Ali grabbed a microphone and shouted: Ali's next boxing match would be with Joe Frazier. Bonavena would later die under tragic circumstances in 1976. Muhammad Ali vs. Oscar Bonavena Heavyweight boxers Muhammad Ali and Oscar Bonavena fought at Madison Square Garden in New York City on December 7, 1970. Ali won the bout through a technical knockout in the 15th round. According to Ferdie Pacheco, Ali absorbed more punishment in this particular fight than in any of his previous fights, and it was a mistake for Ali to have fought with Bonavena just before his first fight