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
Lennox Lewis vs. Vitali Klitschko against Kirk Johnson in which only Lewis' IBO title would be on the line. Klitschko was to fight on the undercard and take on Lewis in December. Before the Lewis–Johnson fight could take place, Johnson was forced to pull out with a chest injury. As such, Lewis and Klitschko agreed to face one another on June 21, rather than later in the year as originally planned. Though Klitschko came into the fight as the underdog, he was able to get off to a great start in the fight. Klitschko was the aggressor through the first two rounds and landed many