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
World Boxing Association titles in the same weight class as a "Super Champion", "Unified Champion", or "Undisputed Champion". This applies even if the WBA title is not one of the titles held by the "Undisputed Champion." In September 2008 for example, Nate Campbell was recognized as the WBA's "Undisputed Champion" at lightweight due to holding the WBO and IBF titles as well, while the WBA's "Regular" champion was Yusuke Kobori. If a fighter with multiple titles also holds the WBA's title, the fighter is promoted to "Super Champion" and the WBA title—which is then referred to as the "Regular" title—becomes vacant for competition