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
AIBA World Boxing Championships AIBA World Boxing Championships The AIBA World Boxing Championships and the AIBA Women's World Boxing Championships are biennial amateur boxing competitions organised by the International Boxing Association (AIBA), which is the sport governing body. Alongside the Olympic boxing programme, it is the highest level of competition for the sport. The championships was first held in 1974 Havana, Cuba as a men's only event and the first women's championships was held over 25 years later in 2001. The men's and women's competitions are held separately and since 2006 the biennial championships have been held in alternating years.The number of weight categories