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
Matt Skelton on split decision handing him his first pro defeat. In July 2006, he regained his Commonwealth title by easily outboxing Williams. Skelton was due to defend his title against Audley Harrison in December 2006, but the fight didn't take place. Instead, the fight against Michael Sprott for the second time was rescheduled for 14 July 2007, in which Skelton defended his title in a 12-round battle. Matt Skelton faced WBA Heavyweight Champion Ruslan Chagaev on 19 January 2008 in Düsseldorf. Skelton fought bravely, but the superior boxing skills of his opponent were too much, and he succumbed to a unanimous