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
Quintuple champion Quintuple champion In different sports an athlete who wins five crowns, titles, medals, belts, or other distinctions is called a Quintuple Champion. In boxing, a quintuple champion is a boxer who has won world titles in at least five different weight classes. The first man in boxing to earn this distinction was Thomas Hearns on November 4, 1988. Hearns won first the Welterweight (147 lbs) title, later annexed the Super Welterweight (154 lbs) belt. Rather than win the next closest division in weight, the Middleweight (160 lbs), he moved up to three divisions to earn the Light Heavyweight (175 lbs)