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
Vitali Klitschko and Wladimir signed with the German athlete-promotion company Universum. With both brothers holding PhDs and being multilingual, their refined and articulate personalities made for mainstream marketability when they moved to Germany and Universum. In time, they became national celebrities in their adopted home country. In his 25th pro fight on 26 June 1999, Klitschko won the WBO Heavyweight title from Herbie Hide of the United Kingdom by a second-round knockout. He successfully defended the title twice. He defeated Ed Mahone by knockout in the third round and beat Obed Sullivan, who retired after the ninth round. By April 2000 Vitali