Rahman became a two-time heavyweight champion when the WBC chose to give its heavyweight championship to him on November 10, 2005. Rahman's contract with Don King was terminated by a U.S. Bankruptcy Court judge on December 9, 2005, and he signed with Top Rank Boxing instead. King had brought out the WBC belt to court, but it was rejected as evidence that the bankruptcy court didn't consider King to be the legal owner of the belt. The WBC subsequently named its secondary champion (who at the time was Vitali Klitchko) as the new champion. After losing his title, Rahman returned to the ring in April 2006. He fought three times between April and September 2006, all of which were successful defenses of his title. In October 2006, he returned to the ring against former champion Joe Louis Clarke, who was looking for his third consecutive win after defeating Michael Grant and Chris Davies previously. Hasim Rahman defeated Clarke via technical knockout in the ninth round. In February 2007, it was announced that Rahman would fight for yet another world title - this time the IBF version held by John Ruiz. The fight took place on March 4th in Las Vegas and Hasim Rahman won by unanimous decision. After this victory, he decided to retire from boxing. His final record was 3 victories and no losses during his three years with Top Rank.