Djokovic beats Federer to win fourth successive ATP finale title

Updated: 2015-11-23 09:50

(Xinhua)

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Djokovic beats Federer to win fourth successive ATP finale title

Roger Federer of Switzerland returns a ball during the men's singles final against Novak Djokovic of Serbia at the ATP World Tour Finals at the O2 Arena in London, Britain, Nov 22, 2015. Federer lost 0-2. [Photo/Xinhua]