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 done with Lennox Lewis in 1995 to 2003. In 2006, Klitschko regained a portion of the world heavyweight championship after defeating Chris Byrd in a rematch to win the IBF and IBO titles. He won the WBO title for a second time by defeating Sultan Ibragimov in 2008. Following his defeat of Ruslan Chagaev in 2009, Klitschko was awarded the "Ring" and lineal titles, and lastly he won the WBA title from David Haye in 2011. In September 2015, Klitschko was ranked as the world's best active boxer, pound for pound, by BoxRec; in November 2014, he reached a career