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. Chris Byrd of the fight with Byrd being elusive and making himself a difficult target. After 9 rounds Vitali had suffered a torn rotator cuff and despite being clearly ahead on the scorecards (88-83, 88-83, & 89-82) he retired on his stool handing the win to Byrd. Harold Lederman, HBO's unofficial judge, had Klitschko ahead 88-83 at the time of the stoppage. Vitali's status as a rising star of the Heavyweight division took a knock after this with HBO commentator Larry Merchant said, "He doesn’t have the mentality of a champion. I can hardly believe what I just saw." Byrd's first defence