McClellan vacated the title to move up to super middleweight. Įubank was expected to move up to super middleweight, the title was then reportedly vacated 1 day after. Ramírez vacates the title to move up to light heavyweight. Ĭalzaghe, citing difficulty making weight, vacated the title after moving up to light heavyweight. He later moved up to light heavyweight.Ĭollins was stripped of the title in October 1997 after suffering a leg injury during training camp and subsequently withdrawing from his bout against Joe Calzaghe. Hearns's title was vacated on WBO's April 1991 ratings posted on 8 May. Álvarez vacated the title to move down to super middleweight. īrähmer was stripped of the title after withdrawing from a bout against Nathan Cleverly, citing an eye injury. Moorer vacated the title to move up to heavyweight.Įrdei vacated the title to move up to cruiserweight. īriedis stripped of title for not agreeing on an immediate rematch with Głowacki. Usyk vacated the title to move up to heavyweight. Haye vacates the title to move up to heavyweight. Nelson retired after suffering a back injury during training camp for his bout against Enzo Maccarinelli.
Michalczewski vacated the title in favor of the WBO light heavyweight title, which he already held. This weight class is designated as cruiserweight by the WBA, WBC, and IBF. įury, who had previously withdrawn from a rematch against Wladimir Klitschko before testing positive in a Voluntary Anti-Doping Association (VADA) test for cocaine on 29 September, vacated the title on 12 October 2016 after testing positive a second time, citing his need to focus on treatment for depression. Sanders vacated the title to sign with Don King. Īkinwande vacated the title at the request of the WBC to become the mandatory challenger of the upcoming fight between Lennox Lewis and Oliver McCall for the vacant belt. īowe was stripped of the title when he rejected Don King's purse offer. Moorer vacated the title so that he could be ranked by other sanctioning bodies. Mercer was stripped of the title in December 1991 for signing for a bout against Larry Holmes instead of mandatory challenger Michael Moorer. The WBO is one of the four major governing bodies in professional boxing, and has awarded world championships in 17 different weight classes since 1989.īoxers who won the title but were stripped due to the title bout being overturned to a no contest are not listed. This is a list of WBO world champions, showing every world champion certified by the World Boxing Organization (WBO).
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