World Boxing Organization (as they did with several established champions in the lower weight divisions), the WBO sanctioned a fight between two relatively unknown fighters, Francesco Damiani (winner of the super heavyweight silver medal at the 1984 Summer Olympics) and Johnny DuPlooy, to determine the inaugural holder of its own heavyweight title in 1989. All other sanctioning bodies of boxing recognized the then-undefeated Mike Tyson as the undisputed heavyweight champion. Damiani, meanwhile, went on to become the first WBO heavyweight champion. At heavyweight, especially in the United States, the organization initially struggled to gain credibility as a major sanctioning body, with WBO heavyweight
Floyd Patterson Marciano's announcement, Jim Norris of the International Boxing Club stated that Patterson was one of the six fighters who would take part in an elimination tournament to crown Marciano's successor. "The Ring" then moved Patterson into the heavyweight rankings, at number five. After beating Tommy "Hurricane" Jackson in an elimination fight, Patterson faced former Light Heavyweight Champion Archie Moore on November 30, 1956, for the World Heavyweight Championship. He beat Moore by a knockout in five rounds and became the youngest World Heavyweight Champion in history, at the age of 21 years, 10 months, 3 weeks and 5 days. He