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 Championship (WWE) December 15, 2013, to unify the titles. Subsequently, the WWE Championship was renamed WWE World Heavyweight Championship. The unified championship retained the lineage of the WWE Championship, and the World Heavyweight Championship was retired. With his victory over John Cena, Randy Orton became the final World Heavyweight Champion. Like with the Undisputed Championship, the Big Gold Belt was used in tandem with the WWE Championship belt to represent the WWE World Heavyweight Championship until a single belt was presented to then champion Brock Lesnar in August 2014. The following is a list of dates indicating the transitions of the World