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 came to nothing. Haye reiterated a challenge to Klitschko to fight him in 2009. In his second fight, he wanted to fight JD Chapman who he claimed was a similar style to the Klitschkos. Haye also added that the heavyweight division was scared of him. In July 2008 Wladimir Klitschko said that Haye was a possible opponent for him to fight next. Haye started to call out the Klitschkos after he knocked out Monte Barret in the 5th round in 2008. In late 2008 Haye and Vitali verbally agreed to terms to fight in the summer. However Klitschko fought mandatory