Professional boxing knocked him out in brutal fashion. This fight made Hagler famous; he was able to lure Ray Leonard out of retirement in 1987, but lost in a highly-controversial decision. Hagler retired from boxing immediately after that fight. In the latter half of the decade young heavyweight Mike Tyson emerged as a serious contender. Nicknamed "Iron Mike", Tyson won the heavyweight unification series to become world heavyweight champion at the age of 20 and the first undisputed champion in a decade. Tyson soon became the most widely known boxer since Ali due to an aura of unrestrained ferocity, such as that
World Heavyweight Wrestling Championship (original version) while Joe Stecher is the youngest champion, winning at the age of 22 years, 103 days. The final reign was disputed between Ed Lewis and Edouard Carpentier and the latter was in his first and therefore only reign. All matches were held at house shows. Various promotions have been home to world heavyweight championships with origins that can also be traced back to the World Heavyweight Wrestling Championship. The National Wrestling Alliance World Heavyweight Championship assumed the original world championship's position as the preeminent wrestling championship, and claimed its lineage. Most of the following championships, all based in North America,