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 of the undercard of Lewis' fight with Kirk Johnson for the IBO title, as the WBC would not sanction the fight for their title. Johnson, however, pulled out of the fight due to injury and Klitschko, due to his being in training for a fight on the same day as Lewis, took the fight on short notice. Immediately after he accepted, the WBC elected to sanction the fight as a title match and Lewis' "The Ring" title was also up for grabs in addition to his lineal title. Klitschko, a 4–1 underdog, dominated the early going with many harder punches.