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 the sixth round, Vitali was in total control. The end came when the referee stopped the fight in the ninth round as Gómez appeared unable to withstand any more hits. On 26 September, Klitschko earned a one-sided TKO victory over Chris Arreola at the Staples Center in Los Angeles when Arreola's trainer, Henry Ramirez, asked the referee to stop the fight. Arreola was considered at the time one of the division's hardest punchers; however, Klitschko kept Arreola at bay with his left jab and hit him almost at will with his right. Arreola had been influenced by Samuel Peter's defeat