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
Danny Williams (boxer) Danny Williams (boxer) Daniel Peter Williams (born 13 July 1973) is a British former professional boxer. A veteran of the sport since 1995, he held the British heavyweight title twice between 2000 and 2010, and the Commonwealth heavyweight title twice between 1999 and 2006. Williams is best known for scoring an upset knockout victory against Mike Tyson in 2004, which earned him a mandatory WBC heavyweight title opportunity. In the same year, he challenged then-reigning champion Vitali Klitschko, but was stopped in eight rounds. As an amateur boxing out of the famous Lynn AC boxing gym in SE London, Williams