Wladimir Klitschko Universum Box-Promotion in Hamburg under the tutelage of Fritz Sdunek, often being featured on fight cards alongside his elder brother Vitali. After building an undefeated record of 24–0 with 22 KOs, he suffered his first loss to 24–13–1 Ross Puritty, in what was Klitschko's first and only professional fight in Ukraine. Puritty forced Klitschko, who had at that time not gone beyond 8 rounds, to punch himself out. Klitschko began to be overwhelmed in the 10th round and went down twice but was allowed to continue. At the start of the 11th round, with Puritty continuing to land hard punches,
Vitali Klitschko vs. Dereck Chisora later. Chisora had been chasing a fight with Vitali's fellow world champion and brother Wladimir, and with that fight scheduled to happen on 11 December 2010, Klitschko pulled out just days prior with a torn abdominal muscle. The rescheduled fight for 30 April 2011 was also cancelled so [Wladimir] Klitschko could fight David Haye on July 2. With [Vitali] Klitschko due to fight Adamek, this left Chisora with no other option than to face his mandatory challenger for the British title, the upcoming Tyson Fury. Chisora's 14-0 win streak ended at the hands of the undefeated Fury, who won via