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 2003 to determine who would face Lewis next. Klitschko easily dispatched Johnson, winning by second-round technical knockout, to set up a rematch with Lewis. However, rather than proceed with his rematch with Klitschko, Lewis announced his retirement two months later on February 7, 2004, vacating his titles in the process. Two months later, Klitschko met the WBC's number two ranked contender and then-reigning WBO champion Corrie Sanders, who had defeated Klitschko's brother Wladimir earlier in 2003, for the vacant WBC and "The Ring" Heavyweight titles. Klitschko defeated Sanders, who relinquished his WBO title to fight Klitschko, by eighth-round technical knockout