Klitschko brothers represented Ukraine at the 1996 Olympics, winning a gold medal in the super-heavyweight division. In 1996, when still an amateur, Vitali Klitschko tested positive for a banned substance and was removed from the Ukrainian boxing team. In June 1999, Vitali Klitschko won the WBO Heavyweight title from Herbie Hide via second-round knockout. He successfully defended the title twice before losing it to Chris Byrd. Six months later, younger brother Wladimir dethroned Byrd via lopsided points decision. He registered five successful title defenses, all by TKO until suffering an upset TKO loss to Corrie Sanders in March 2003. Vitali Klitschko lost
Wladimir Klitschko Klitschko's trainer, Fritz Sdunek, entered the ring and stopped the fight. Three years later, Klitschko's brother Vitali stopped Puritty in the 11th round himself. On 18 March 2000, Klitschko fought Paea Wolfgramm, whom he fought previously in the 1996 Super Heavyweight Olympic Finals. In their professional rematch, Klitschko knocked Wolfgramm out in the first round. On 14 October 2000, in Cologne, Germany's Kölnarena, Klitschko won the WBO Heavyweight Championship from American Chris Byrd by a wide unanimous decision by scores of 120–106, 119–107, and 118–108, flooring his opponent twice. Byrd had previously upset his elder brother Vitali (who pulled out