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 to become the first undisputed World Heavyweight Champion. The only other reigning champion with claim to the belt at the time was Tom Jenkins the American Heavyweight Championship, which unified the American Greco-Roman Championship with the American Catch-As-Catch Can Championship. Jenkins was eventually defeated by Frank Gotch, who took over as the only man with a potentially legitimate claim to being "the true champion". Hackenschmidt and Gotch finally met in the ring on April 3, 1908 in Chicago, Illinois. Gotch defeated Hackenschmidt to win the World Heavyweight Championship, then abandoned the American Heavyweight Championship in a process similar to today's