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 2011 Pan American Games – Heavyweight Boxing at the 2011 Pan American Games – Heavyweight Men's heavyweight boxing competitions at the 2011 Pan American Games in Guadalajara will be held from October 22 to October 29 at the Expo Guadalajara Arena. Heavyweights were limited to those boxers weighing less than or equal to 91 kilograms. The defending champion was Osmay Acosta from Cuba. Like all Pan American boxing events, the competition was a straight single-elimination tournament. Both semifinal losers were awarded bronze medals, so no boxers competed again after their first loss. Bouts consisted of four rounds of two minutes each, with one-minute breaks between rounds.