Djokovic beats Federer in thrilling ATP World Tour Final

Novak Djokovic beats Roger Federer to win the ATP World Tour Final in a thrilling encounter at London's O2 Arena.

The Serb won 7-6 (8-6) 7-5 to add the season-ending title to his Australian Open victory and top ranking.

Federer had been trying to win the trophy for the third year running, while it is the second time Djokovic has won the ATP finale, following his triumph in Shanghai four years ago.

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