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
World Heavyweight Championship (Omaha) Von Erich on September 7, 1963. World Heavyweight Championship (Omaha) The World Heavyweight Championship was a professional wrestling world heavyweight championship sanctioned by a group of National Wrestling Alliance (NWA) promoters led by the NWA affiliate in Omaha, Nebraska, United States. These promoters chose to recognize Édouard Carpentier as NWA World Heavyweight Champion following his disputed win over NWA World Heavyweight Champion Lou Thesz on June 14, 1957. The majority of NWA promoters continued to recognize Thesz as their champion. It was often contested alongside the AWA World Heavyweight Championship, and the two titles were finally unified when AWA champion