Novak Djokovic downs Roger Federer in three sets at ATP World Tour Finals

Updated: 06 November 2013 07:49 IST

On the back of a chaotic and disappointing season, the former World No. 1 tasted defeat for the second time in less than a week against defending champion Novak Djokovic 6-4, 6-7 (2), 6-2 on Tuesday.

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