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
Wladimir Klitschko vs. David Haye and Wladimir had wanted to fight Haye. With Vitali wanting to have a fight with Haye in 2010 which never happened. While Haye won the WBA title after defeating Nikolay Valuev. On 16 April 2009, Haye wore a T-shirt depicting him holding the heads of the Klitschko brothers while standing atop their decapitated bodies. At the same time, he declared a war on both the Klitschko brothers, hoping to first defeat Wladimir, then Vitali. Two press conferences were held in announcement of the fight. The first one took place in Hamburg, the second in London. There was also an HBO