The WBO Belt
The World Boxing Organization, founded in 1988 and based in San Juan, Puerto Rico, is the youngest of the big four. This guide explains how a belt once dismissed as minor became a full major, and what that means for the fights you bet.
From minor belt to major
The WBO was founded in 1988 in San Juan and was initially dismissed by some as a minor belt. It earned full legitimacy over time — a commonly cited milestone is the WBC recognising the WBO around 2004, which is generally taken as the start of the modern "four-belt era". South Africa's Corrie Sanders held the WBO heavyweight title, winning it in 2003, a retired-era reference point.
One of the four majors
The WBO now sits firmly alongside the WBC, WBA and IBF as one of the four belts that count toward unified and undisputed status. For betting, treat a WBO title fight the same as any other major: a genuine world title with real ranking implications. See the undisputed championship guide for how the four fit together, and over/under rounds for one common market.
Frequently asked questions
Is the WBO a real major belt?
Yes. Although some dismissed it as minor when it launched in 1988, it is now one of the four majors and counts toward unified and undisputed status alongside the WBC, WBA and IBF.
When did the four-belt era begin?
There is no fixed date, but the WBC recognising the WBO around 2004 is commonly cited as the start of the modern four-belt era, with all four bodies treated as majors.