World Boxing Organization
The youngest of the 'big four,' the WBO was founded in Puerto Rico in 1988 by businessmen who had broken away from the WBA. Initially dismissed as a 'paper title,' the WBO earned full equivalence with the WBA, WBC, and IBF in 2007 when the four bodies agreed to recognise each other's belts for unification purposes. Today the WBO is often the most flexible of the four, sanctioning fights other bodies refuse.
Ranking methodology
Monthly rankings governed by a Championship Committee. The WBO publishes a less granular formula than the WBC or IBF, weighting recent activity and KO percentage. The body also publishes a "Latino" regional title — a feeder belt heavily used by Top Rank and Golden Boy.
Super-title criteria
The WBO recognises a single champion per division but, similar to the WBC, grants a "Super Champion" honorific to long-reigning unified champions. The status is largely ceremonial.
Notable controversies
- ▸The WBO's reputation, until at least 2010, as a politically pliable belt-of-convenience for promoters who could not get a fighter ranked by the other three bodies.
- ▸Ranking Roy Jones Jr. at no. 1 cruiserweight in 2018 after almost a year of inactivity to facilitate his retirement bout, drawing sharp criticism from the BWAA.
- ▸Sanctioning the 2019 Andy Ruiz Jr. vs. Anthony Joshua rematch in Saudi Arabia — a move that drew political backlash but established the body as a leader in regional sanctioning.