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 championship (formerly the WCW World Heavyweight Championship) and WWF Championship at Vengeance in 2001, with Chris Jericho becoming the first Undisputed WWF Champion (and the first undisputed champion in over 50 years in professional wrestling in general). The championship was then represented by the belts of its two predecessors until a singular belt design was commissioned. By May 2002, the WWF had been renamed to World Wrestling Entertainment and the Undisputed WWE Championship, as it was now called, became the top championship of the promotion. With the purchase of WCW during the previous year, WWE's roster had doubled in size and