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
ECW World Heavyweight Championship at One Night Stand 2006. Heyman had originally stated that either the WWE Championship or the World Heavyweight Championship would "become" the ECW World Heavyweight Championship if a competitor designated to the ECW brand became WWE Champion or World Heavyweight Champion at the event. However, Rob Van Dam later declared that he would hold both titles simultaneously instead. The title became known as the ECW World Championship in June 2006, and later simply as the ECW Championship in August 2007. Following the events of the WWE brand extension, an annual WWE draft was established, in which select members of the