Novak Djokovic reached the semifinals of the ATP World Tour Finals in London with a 6-3, 7-5 victory over Tomas Berdych in their round-robin match. Earlier, Roger Federer clinched first place in the group by beating Kei Nishikori, 7-5, 4-6, 6-4, to finish the round-robin stage unbeaten.
Sports Briefing | Tennis: Novak Djokovic and Roger Federer Advance at World Tour Finals
