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
Goody Petronelli out to be Hagler's final fight. Petronelli trained others who would fight in world title bouts: World Boxing Organization super middleweight champion Steve Collins; Hagler’s brother, United States Boxing Association middleweight champion Robbie Sims, who lost to Sumbu Kalambay in 1988 for the WBA championship; and Malawian light heavyweight Drake Thadzi, who lost to Virgil Hill in a WBA title bout in 1995. Petronelli also trained his brother’s son, Tony, who won the North American Boxing Federation light welterweight title in 1976; New England super featherweight champion Mike Cappiello; Massachusetts middleweight champion Mike Culbert; and Kevin McBride, whose TKO victory