As a boxer, Klitschko won multiple world heavyweight championships. He held the WBO title from 1999 to 2000, the "Ring" magazine title from 2004 to 2005, and the WBC title twice between 2004 and 2013. Overall, Vitali has defeated 15 fighters for the world heavyweight title. In 2011, Vitali and his younger brother Wladimir Klitschko entered the Guinness World Records as the pair of brothers with most world heavyweight title fight wins (30 at the time; 40 as of 2020). From 2006 until 2015, Vitali and Wladimir (also a multiple-time world champion) dominated heavyweight boxing, a period typically known as the "Klitschko Era" of the division.