LONDON — Serbia's Novak Djokovic clinched his place in the semi-finals of the ATP World Tour Finals when he won the first set of his final round-robin match against Tomas Berdych 6-3 on Thursday.
The world number one required only one set to take the runners-up spot in his group behind unbeaten group winner Roger Federer who earlier beat Kei Nishikori.
He will face Rafael Nadal in the semi-final on Saturday.
Djokovic, holder at the London year-ender, was well beaten by Federer on Tuesday but bounced back with two service breaks in the opening set against Berdych to take it comfortably.