Djokovic Completes Three-Peat of ATP World Tour Titles After Federer's Withdrawal

Roger Federer pulled out of his ATP Tour Finals showdown with Novak Djokovic just before the final was due to start Sunday because of a back injury, casting doubt on his fitness ahead of the Davis Cup final. With Federer sidelined, Djokovic was awarded the Tour Finals title for the third successive year -- making him the first player to achieve that feat since Ivan Lendl in the 1980s. (All images AFP)