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
HBO World Championship Boxing boxing events, have aired live on HBO Canada with later repeats on TSN. HBO World Championship Boxing HBO World Championship Boxing was an American sports television series, premiering in January 1973 that has shown a number of significant boxing events since then. "WCB"s first event was fought in Kingston, Jamaica, where George Foreman defeated Joe Frazier in two rounds to win the world heavyweight championship. On September 27, 2018, HBO announced they would be dropping boxing from the network following its last televised match on October 27, although there were two additional airings, one on November 24, 2018 and the