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 Tapings" as the NWA World Heavyweight Champion, despite the fact that in regards to the storyline, Flair, who had returned to WCW and regained the NWA title, was still champion. After leaving the NWA, WCW kept the Big Gold Belt, and it was renamed the WCW International World Heavyweight Championship. At Starrcade in December 1993, Flair won the WCW World Heavyweight Championship, by defeating Vader. WCW decided to unify the WCW World Heavyweight Championship (represented by the new belt) and International Championship (represented by the "Big Gold Belt"), by having Flair wrestle Sting in June 1994. Flair won and unified