Camel and Mate Parlov fought to a draw in the first Cruiserweight championship bout on 12 August 1979, sanctioned by the World Boxing Council. Camel won the rematch to become champion. Since the WBC was the only sanctioning body to recognize a Cruiserweight division at the time, he is considered by some as an undisputed champion.
O'Neil Bell defeated Jean-Marc Mormeck on 7 January 2006, by knockout in round 10, unifying his IBF belt with Mormeck's WBA and WBC belts. That distinction lasted just under three months, as the IBF withdrew its recognition of Bell when Bell failed to reach an agreement to fight the organization's mandatory challenger.
David Haye defeated Enzo Maccarinelli on 8 March 2008, by knockout in round 2, unifying his WBA and WBC belt with Maccarinelli's WBO belt. On 12 May, he relinquished his WBC belt and would eventually relinquish the WBA and WBO belts to move up in weight and attempt to win the heavyweight crown like Evander Holyfield had done before him.
On October 30, 2012, Jones was stripped of the title and named "Champion in Recess" due to his failure to meet mandatory challenger and interim champion Denis Lebedev in a timely manner thus elevating Lebedev to full champion status. The two would eventually meet on May 17, 2013 with Jones knocking Lebedev out in the 11th round of a brutal fight. However, in the post-fight drug screen Jones tested positive for a banned substance and although the fight still stands as a win for Jones, Lebedev was subsequently reinstated as champion. The WBA ordered a rematch that was scheduled to take place on April 25, 2014 however, Jones once again tested positive for a banned substance in the pre-fight drug screen and the rematch was canceled.
2 Championship recognition withdrawn due to champion's failure/refusal to defend title against mandatory or designated challenger.
3 Relinquished title.
Cruiserweight champions who won belts in other divisions
Braxton, Michalczewski, Hill, Adamek and Tiozzo all were light-heavyweight champions.
Holyfield and Haye are the only former cruiserweight champions to win a piece of the heavyweight title.
Toney won titles at middleweight and super middleweight. He also defeated John Ruiz in an attempt to win the heavyweight title but failed a post-fight drug test and the result was changed to a No Decision.
List of Cruiserweight Champions Prior to 1980
The cruiserweight class was inaugurated by the WBC in 1979, and the belt was to be decided by the winner of a fight between Mate Parlov and Marvin Camel. The bout ended in a draw, and the champion wasn't crowned until their rematch on 31 March 1980, which was won by Camel. The WBA followed suit in 1982, inaugurating their belt in a battle between Ossie Ocasio and Robbie Williams, which was won by Ocasio.