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 of the undercard of Lewis' fight with Kirk Johnson for the IBO title, as the WBC would not sanction the fight for their title. Johnson, however, pulled out of the fight due to injury and Klitschko, due to his being in training for a fight on the same day as Lewis, took the fight on short notice. Immediately after he accepted, the WBC elected to sanction the fight as a title match and Lewis' "The Ring" title was also up for grabs in addition to his lineal title. Klitschko, a 4–1 underdog, dominated the early going with many harder punches.