Wladimir Klitschko vs. Jean-Marc Gilbert Mormeck

In October 2011, Mormeck was signed to fight unified Heavyweight Champion Wladimir Klitschko on 10 December 2011 at Esprit Arena, Düsseldorf, Germany until Klitschko pulled out after having a kidney stone removed on 2 December 2011. The fight was postponed to 3 March 2012. In this fight, Mormeck attempted to be only the third cruiserweight champion to win a world title at Heavyweight, after Evander Holyfield and David Haye.