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
Boxing in the United States in newspapers and access on major television networks. Also the lack of a US Heavyweight world champion. It was hoped in 2015 that the Floyd Mayweather Jr. vs. Manny Pacquiao fight would re-invigorate interest in the sport in the United States but because the fight was disappointing it was perceived as doing further harm to the image of the sport in the United States. Boxing in the United States Boxing's origins began in the United States in 19th Century. The United States became the center of professional boxing in the early 20th century. The sport of boxing came to the