Undisputed champion he was still described as "undisputed champion" by some reports. After Joe Calzaghe's super middleweight victory over Mikkel Kessler in November 2007, he was frequently described as "undisputed champion". Others disputed this, because although he held the WBA, WBC, and WBO belts, he vacated his IBF title in November 2006 rather than face a mandatory challenger, and immediately vacated other titles as well. The unified champion is defined as a boxer that holds at least two world championships of major sanctioning bodies (WBA, WBC, WBO or IBF) in their respective division. Around 2004, the World Boxing Association recognized three different
Undisputed champion most wins in WBO Heavyweight title fights with 8. By 2001, the WBA was giving the same recognition to WBO champions as to WBA, WBC and IBF champions. In 2004, the WBC began naming WBO champions on its ranking listings. The IBF did not recognise the WBO in May 2006, but was doing so by February 2007. Conversely, the WBO explicitly recognises the other three sanctioning bodies. Some sources consider the WBO title necessary for an undisputed champion. Others continue to consider it sufficient to hold the WBA, WBC, and IBF titles. Other bodies such as the IBO, IBU, and