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
AWA World Heavyweight Championship territory. The first champion was Pat O'Connor, who was recognized as the first champion upon the AWA's secession from the NWA as O'Connor held the NWA World Heavyweight Championship as well, which he won on January 9, 1959. The creation of the AWA World Heavyweight Championship along with the NWA World Heavyweight Championship would pave the way for the creation of many other world championships in other wrestling promotions. AWA Wrestling Association and the title became inactive in late 1990 and the organization officially closed down in August 1991 with the title also being decommissioned. The championship is featured in