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 Klitschko was unbeaten and a rising star in the heavyweight division, having won all 27 of his contests by knockout. On 1 April, Klitschko had a third title defense against the American Chris Byrd, who was a late replacement. Byrd made himself a difficult target and tried to thwart Klitschko's offense by being elusive. Klitschko won most of the rounds and was heading towards a comprehensive points victory when he suffered a serious shoulder injury. After the ninth round, Klitschko notified his corner that he had a shoulder pain and threw in the towel, thus handing Klitschko his first defeat