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
WCW World Heavyweight Championship with the United States Heavyweight Championship, Cruiserweight Championship, and the WCW Tag Team Championship. After the "Invasion" concluded at Survivor Series in 2001, the title was rebranded as the "World Championship". The title was then unified with the WWF Championship at Vengeance, where Chris Jericho defeated The Rock and Stone Cold Steve Austin to win the World Championship and the WWF Championship respectively. As a result, Jericho was the last World Champion, and he became the first Undisputed WWF Champion. WCW World Heavyweight Championship The WCW World Heavyweight Championship was a professional wrestling world heavyweight championship originally used in World