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
Lennox Lewis vs. Vitali Klitschko title after passing on the chance to face the IBF's number one contender Chris Byrd. Instead, Lewis turned his sights on a possible match with Vitali Klitschko, who had become the WBC's number one contender after defeating Larry Donald by tenth-round technical knockout. In early 2003, however, negotiations for the fight fell through and Lewis began looking into a lucrative rematch with Tyson. The WBC ruled that a rematch with Tyson would be allowed on the basis that the winner would next defend their title against Klitschko. Tyson passed on the rematch, forcing Lewis to accept a less marketable fight