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
HBO World Championship Boxing Ali and Joe Frazier; Larry Holmes vs. Gerry Cooney, for the World Boxing Council heavyweight championship; The Battle of the Champions, when Aaron Pryor beat Alexis Argüello in their first fight; Carnival of Champions, in which Wilfredo Gómez beat Lupe Pintor, and Thomas Hearns beat Wilfred Benítez; Marvin Hagler-Thomas Hearns fight, billed as The War; Thunder Meets Lightning, in which Julio César Chávez beat Meldrick Taylor with two seconds remaining in the twelfth round; Michael Moorer vs. George Foreman, in which Foreman KO'd Michael Moorer to become the oldest heavyweight champion of the world at age 45; James Douglas's stunning