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
Jim Coffey Heavyweight World Champion Jess Willard. Unfortunately for Coffey, Moran won both contests. Following his losses to Moran, Coffey continued to box, taking on other famous names from the time, including Carl Morris, Battling Levinsky, Joe Jeanette and Harry Greb. However, he never again came close to challenging for the world title. Jim Coffey's last professional fight was a 15th round defeat to Martin Burke in the Tulane Arena, New Orleans, on November 18, 1921. Jim Coffey returned to Ireland for good in 1923 and married schoolteacher Kate Kenny in December of that year. Following his retirement from boxing, Jim took