Novak Djokovic at ATP World Tour Finals in London . He won the first nine points to break service and hold for 3-0 in a purple patch to match the color of his tennis shirt . Serbian player Roger Federer 7 - 6 7 - 6 at the O2 Arena . ATP No.1 retrieves breaks of serve in both sets . Denies Federer a seventh title in the end of season showpiece .
Novak Djokovic at ATP World Tour Finals in London . Serbian player Roger Federer 7 - 6 7 - 6 at the O2 Arena . ATP No.1 retrieves breaks of serve in both sets . Denies Federer a seventh title in the end of season showpiece .