Wladimir Klitschko is a Ukrainian heavyweight professional boxer. Klitschko is the current WBA, IBF, WBO, IBO and The Ring world champion Klitschko is the longest reigning IBF, WBO & IBO heavyweight champion in history with the most title defenses for those organizations. Overall, he is the second longest reigning Heavyweight Champion of all time with the second most successful grand total title defenses with 21. On 13 October 2013, Boxrec rated Klitschko as the number two pound-for-pound fighter in the world. On 15 April 2014, he reached a career peak of number three on the pound-for-pound list of Ring Magazine. Klitschko is tied with Muhammad Ali for second on the all-time list for most heavyweight title fights with 25, behind only Joe Louis with 27. He is the younger brother of former WBC, WBO & Ring magazine heavyweight champion Vitali Klitschko.
Since 2005 Vladimir Klitschko has been the dominant force in the heavyweight division, defeating a majority of the top heavyweights in the rankings. When Klitschko won the IBF title against Chris Byrd there were four separate Heavyweight Champions.