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 third most successful title defenses at 15. On 13 October 2013, Boxrec rated Klitschko as the number 2 pound-for-pound fighter in the world. The Ring currently rates Klitschko as the number 4 pound-for-pound boxer in the world. Klitschko is second on the all-time list for most heavyweight title fights, only behind Joe Louis. 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. Since then, he has unified the IBF, IBO, WBO & WBA belts and defeated the WBA Champion in recess. Following his win over Ruslan Chagaev, Klitschko was awarded the vacant Ring Magazine Heavyweight title.