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 on CBS number of their championship fights to 12 rounds. It was also the last fight to air as part of strike replacement programming on CBS because of the NFL strike, which ended three days later. A then 14-0 Oscar de la Hoya appeared on a December 10, 1994 card for CBS. The last time CBS aired a live boxing event prior to 2012, was on January 20, 1997, when then-middleweight champion Bernard Hopkins knocked out Glen Johnson in the 11th round. Boxing on CBS CBS has occasionally broadcast boxing events; its first broadcast occurred in 1948. The network's most recent broadcasts