Klitschko brothers 5 months & 13 days. Vitali retained the WBC Heavyweight Championship until 15 December 2013, relinquishing his belt in pursuit of his political aspirations in his native Ukraine. The Klitschko brothers jointly run the professional boxing promotion companies ""K2 Promotions"" and ""K2 East Promotions"", as well as the ""Klitschko Brothers Fund"", a charity organization. They appear together on German TV shows and commercials, have a website shared between them, and support each other's training and fights. After Vitali's retirement, Wladimir continued to reign as champion & successfully defend all remaining title belts except for the WBC belt. He eventually lost
Vitali Klitschko percentage, he holds one of the highest knockout-to-fight ratios of any world champion in heavyweight boxing history, while also possessing a highly durable chin. His two losses came via a shoulder injury and a deep cut above his eye, both of which were recorded as stoppages rather than outright knockouts; in both fights he was leading on the judges' scorecards. Klitschko is the only heavyweight boxer to have reigned as world champion in three different decades. Along with Oliver McCall, he is also the only world heavyweight champion to have never been knocked down in any fight. Klitschko and George