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 Wrestling Championship (original version) 1928 in Michigan City, Indiana for the Michigan/Illinois World Heavyweight Wrestling Championship version. Joe Stetcher then defeated Zbyszko to become widely recognized champion. The dispute ended when Lewis defeated Stetcher on February 21, 1928. Gus Sonnenburg won the title from Lewis on January 4, 1929, but the recognition of being the world champion by the wrestling section of the National Boxing Association was withdrawn from Sonnenberg for failing to meet real title contenders. Lewis won the title again on April 13, 1931. Lewis was also AWA World Heavyweight Champion in Boston at the time, but lost that title by disqualification