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,
Chris Byrd vs. Wladimir Klitschko the vacant belt. Confirmed bouts: Chris Byrd vs. Wladimir Klitschko Chris Byrd vs. Wladimir Klitschko, billed as Die Rache des Bruders (German for "Revenge Of The Brother"), was a professional boxing match contested on 14 October 2000 for the WBO Heavyweight Championship. After his shock victory over the undefeated Vitali Klitschko, following Vitali suffering a torn rotator cuff, Chris Byrd agreed to face his number one contender, and Vitali's younger brother Wladimir. Wladimir Klitschko had won ten fights in a row following his first pro loss at the hands of journeyman Ross Puritty in December 1998. Klitschko knocked Byrd down