Who was the last undisputed boxing world heavyweight champion before Mike Tyson?
Heavyweight unification series Heavyweight unification series The heavyweight unification series, also known as the Heavyweight World Series, was a sequence of professional boxing matches held in 1986 and 1987 to crown an undisputed champion of the heavyweight class. The series was produced by HBO Sports and promoted by Don King. It ended with Mike Tyson as undisputed champion, holding the championship belts of the International Boxing Federation, World Boxing Association, and World Boxing Council. Prior to the series, the last undisputed heavyweight champion had been Leon Spinks, who won the championship in his 1978 victory over Muhammad Ali. Spinks had been stripped of
Mike Tyson vs. Buster Douglas Mike Tyson vs. Buster Douglas Mike Tyson vs. Buster Douglas, billed as "Tyson Is Back!", was a professional boxing match that occurred at the Tokyo Dome on February 11, 1990. The event is historically significant, as the then-undefeated, undisputed heavyweight champion Tyson lost by knockout to the 42–1 underdog Douglas. The fight is widely considered one of the biggest upsets in sports history. Going into the fight, Mike Tyson was the undefeated and undisputed heavyweight champion of the world. He held the WBC, WBA, and IBF titles. Despite the several controversies that marked Tyson's profile at the time, such as