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 Colored Heavyweight Championship (his successor as colored heavyweight champ) and Sam Langford (who beat Jeanette for the colored title) and the young Harry Wills (who was colored heavyweight champ during the last year of Johnson's reign as world's heavyweight champ). Blacks were not given a shot at the title allegedly because such top boxing promoters as Tex Rickard believed that a fight between two black boxers would not draw at the gate. Jack Johnson fought Joe Jeanette a total of seven times, all during his reign as colored champ before he became the world's heavyweight champion, winning four times and drawing twice (three