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 Heavyweight Championship (WWE) Heavyweight Championship between the Raw and SmackDown brands. The inaugural champion was Triple H, and there were 25 different champions overall. The longest reigning champion was Batista who held the title from April 3, 2005, to January 10, 2006, for a total of 282 days. Triple H holds the record for longest combined reigns at 616 days. The shortest reigning champion was Randy Orton in his fourth reign, who immediately retired the championship upon winning it and unifying it with the WWE Championship. He was also the youngest champion, at the age of 24. The oldest champion was The Undertaker