On October 29, 1960, Cassius Clay, later known as Muhammad Ali, made his professional boxing debut. Clay won by a unanimous decision in six rounds. Clay would go on to win the heavyweight title and shortly thereafter changed his name to Ali. Ali is considered to be one of the greatest boxers of all time, and was known as a fast and elusive fighter and was rarely hit until later in his career. He was also known for his intense rivalry with Joe Frazier, as well as his trash talk.