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 Light Heavyweight Championship (National Wrestling Association) 30, 1957, is the longest reign totaling 1,573 days. Danny McShain's third and seventh reign as champion only lasted seven days, although due to gaps in the championship history the possibility exists that someone else had a shorter reign. World Light Heavyweight Championship (National Wrestling Association) The National Wrestling Association World Light Heavyweight Championship was a professional wrestling championship originally sanctioned by the National Boxing Association (NBA) and subsequently sanctioned by the National Wrestling Association (NWA), an offshoot of the NBA. The championship had an upper limit of , anyone above that limit was considered a heavyweight. The championship was