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 the world heavyweight title in Paris, but nothing came of it. After losing his world heavyweight championship, Johnson never again fought for the colored heavyweight crown. Because great boxers of the era were barred from fighting for the heavyweight championship because of racism, Johnson’s refusal to fight African-Americans offended the African-American community, since the opportunity to fight top white boxers was rare. Jeanette criticized Johnson, saying, "Jack forgot about his old friends after he became champion and drew the color line against his own people." The World Boxing Council attempted to create a similar championship in 2004 called the All