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 Heavyweight Champions in history. Despite having a four-year hiatus from the sport, Vitali has proven to be a remarkably effective and dominant Heavyweight Champion once again. Alongside his brother Wladimir, he also fights on for their shared ambition of holding all four Heavyweight Championship belts together, an ambition that was realised on 2 July 2011 when brother Wladimir defeated David Haye to win the WBA Heavyweight Championship. In January 2012, he was awarded WBC Fighter of the Year for 2011. Klitschko was in negotiations for a possible bout with former WBA Heavyweight title holder David Haye on 3 March 2012.