<div style="color: #222222; font-family: arial, helvetica, sans-serif; font-size: small;">''<div>In Tennis, Alexander Zverev upset world number one Novak Djokovic in straight sets to claim the season-ending ATP Finals and earn the biggest victory of his career. Djokovic was the heavy favourite but outclassed 6-4, 6-3 by the German last night in London. </div>''<div></div>''<div>The 21-year-old Zverev became the youngest champion of the season-ending event since Djokovic claimed the first of his five titles a decade ago and the first from Germany since 1995.</div>''<div></div>''<div>Djokovic was attempting to tie Roger Federer's record of six titles but followed the same path as the Swiss great, who lost to Zverev in the semi-finals at the O2 Arena. </div>''<div></div>''<div>Zverev also became the first player to beat both Djokovic and Federer in the same ATP Finals. </div></div>''<div class="yj6qo" style="color: #222222; font-family: arial, helvetica, sans-serif; font-size: small;"></div>