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
Derek Minter riding Nortons in home short circuit races. The new team were to use older 1950s Gileras on which former World Champion rider Duke had much success, but which with the newer, upgraded tyre technology of the 1960s were considered still competitive. The team was devised by Duke to challenge the domination of Mike Hailwood on the MV, and had early successes at Silverstone and Brands Hatch in the UK, and Imola in Italy. In May 1963, whilst riding a 500 cc Manx Norton at Brands Hatch, Kent, Minter was involved in a battle for the lead with Dunstall Norton rider