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. Ken Norton met for the third and last time on September 28, 1976, at Yankee Stadium, Bronx, New York, USA, completing their trilogy. This time, 34-year-old Ali entered the ring as Heavyweight Champion. Both fighters showed their strengths, but neither established themselves as the obvious winner. Most commentators gave the fight to Norton. Ultimately, Ali won by a unanimous decision, thereby retaining his title. Muhammad Ali vs. Ken Norton Muhammad Ali fought three professional boxing matches against Ken Norton between 1973 and 1976. Ali won the series 2–1. Still rebuilding a winning record after his first professional loss to Joe Frazier, Ali