Muhammad Ali brought unprecedented speed and grace to the sport of boxing, and his charm and wit changed forever what we expect a champion to be. His accomplishments in the ring were the stuff of legend: two fights with Sonny Liston, where he proclaimed himself “The Greatest” and proved he was; three epic battles with Joe Frazier; the stunning victory over George Foreman in Zaire; and dethroning Leon Spinks to become heavyweight champion for an unprecedented third time.