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
WCW World Heavyweight Championship with the United States Heavyweight Championship, Cruiserweight Championship, and the WCW Tag Team Championship. After the "Invasion" concluded at Survivor Series in 2001, the title was rebranded as the "World Championship". The title was then unified with the WWF Championship at Vengeance, where Chris Jericho defeated The Rock and Stone Cold Steve Austin to win the World Championship and the WWF Championship respectively. As a result, Jericho was the last World Champion, and he became the first Undisputed WWF Champion. WCW World Heavyweight Championship The WCW World Heavyweight Championship was a professional wrestling world heavyweight championship originally used in World