Wladimir's older brother, Vitali Klitschko, is also a former WBC, WBO, and The Ring heavyweight champion.
From 2006 until 2015, Wladimir and Vitali dominated heavyweight boxing, a period typically known as the "Klitschko Era" of the division.
On 14 September 2015, Box Rec rated Klitschko as the number one fighter in the world, pound for pound.
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A highly strategic and cerebrally-minded boxer, Klitschko is considered to be one of the greatest heavyweight champions of all time, As an amateur, Klitschko represented Ukraine at the 1996 Olympics, winning a gold medal in the super-heavyweight division.
After turning professional later that year, he defeated Chris Byrd in 2000 to win the WBO heavyweight title.
Byrd had previously upset his elder brother Vitali (who pulled out injured during their bout).
Klitschko suffered an upset TKO loss to Corrie Sanders on 8 March 2003 in Hanover, Germany.
He won the WBO title for a second time by defeating then-unbeaten champion 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.Klitschko's coach, Fritz Sdunek, stopped the fight.On 18 March 2000, Klitschko fought Paea Wolfgramm, whom he fought previously in the 1996 Super Heavyweight Olympic Finals.Until his defeat by Tyson Fury in 2015, Klitschko was also recognized as champion by the Transnational Boxing Rankings Board, while the WBA recognized him as one of its "Super champions", a distinction given to boxers who hold that title in addition to those by other sanctioning bodies in the same division.Overall, he became the second longest reigning heavyweight champion of all time, and has the second most successful title defenses total of any heavyweight boxer with 23 (including his initial reign as WBO champion), behind Joe Louis (25) and ahead of Larry Holmes (20) and Muhammad Ali (19).In their professional rematch, Klitschko knocked Wolfgramm out in the first round.