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 at the 2015 Pan American Games – Men's Heavyweight Boxing at the 2015 Pan American Games – Men's Heavyweight The men's heavyweight competition of the boxing events at the 2015 Pan American Games in Toronto, Ontario, Canada, was held between the 18 and 24 of July at the General Motors Centre. The defending champion is Lenier Pero of Cuba. Heavyweights is limited to those boxers weighing less than or equal to 91 kilograms. Like all Pan American boxing events, the competition is a straight single-elimination tournament. Both semifinal losers are awarded bronze medals, so no boxers compete again after their first loss. Bouts consist of a 3 rounds "10-point