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 done with Lennox Lewis in 1995 to 2003. In 2006, Klitschko regained a portion of the world heavyweight championship after defeating Chris Byrd in a rematch to win the IBF and IBO titles. He won the WBO title for a second time by defeating Sultan Ibragimov in 2008. Following his defeat of Ruslan Chagaev in 2009, Klitschko was awarded the "Ring" and lineal titles, and lastly he won the WBA title from David Haye in 2011. In September 2015, Klitschko was ranked as the world's best active boxer, pound for pound, by BoxRec; in November 2014, he reached a career