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 final. In his autobiography, published in Germany in 2004, the boxer revealed that he tested positive for a banned steroid in 1996. He attributed the presence of the drug to treatment of a leg injury, but was dismissed from the Ukrainian boxing team and missed the Atlanta Olympics. His brother Wladimir moved up from heavyweight to super heavyweight to take his place in the squad and won the Olympic gold medal. His amateur record was 195–15 with 80 knockouts. Klitschko began his professional boxing career in 1996, winning his first twenty-four fights by either early knockout or technical knockout. He