Vitali Klitschko and Wladimir Klitschko, 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 2011, they entered the Guinness World Records book as the pair of brothers with most world heavyweight title fight wins. 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, they each developed a style that utilized their athleticism and arm reach to break down opponents.
