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 White Heavyweight Championship belt declaring him the “White Heavyweight Champion of the World” after he scored a first round T.K.O. over Pat Cominsky in a bout at Roosevelt Stadium in Jersey City, New Jersey on 26 September 1940, but it was a publicity stunt. The fight was not promoted as being for the white heavyweight championship, and Cominsky would not have won the belt had he beaten Baer. The belt was a publicity stunt dreamed up by boxing promoters who were trying to pressure promoter Mike Jacobs into giving the ex-world heavyweight champion a rematch with current champ Joe Louis. (Louis had K.O.ed