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 the Klitschko brothers moved from Hamburg, Germany to Los Angeles. In January 2004 they notified Universum that they would not re-sign when their contracts expired in April. Universum sued the brothers, arguing that their recent injuries had triggered a clause binding them beyond April. The suit was ultimately resolved in favor of the Klitschkos in November 2009. Klitschko faced South African Corrie Sanders on 24 April 2004 for the WBC heavyweight championship and "The Ring" belts that had been vacated by Lewis. Sanders had stopped younger brother Wladimir in the second round (TKO) on 8 March 2003. Klitschko took a