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
Klitschko brothers Klitschko brothers Vitali Klitschko (born 19 July 1971) and Wladimir Klitschko (born 25 March 1976), known as the Klitschko brothers, are Ukrainian former professional boxers. During their peak years between 2004 and 2015, they were considered the dominant world heavyweight champions of their era, and among the most successful champions in boxing history. In the years following the retirement of undisputed heavyweight champion Lennox Lewis in 2004, the Klitschko brothers would eventually accumulate all four major world heavyweight titles. Known for their exceptionally large physiques and technical boxing styles, they each developed a style that utilized their athleticism and arm