Catch-up: ATP Finals - Alexander Zverev v John Isner

1. Final day of round-robin matches
2. Alexander Zverev beats John Isner 7-6 (7-5) 6-3 to reach last four
3. German will face Roger Federer in Saturday's semi-finals
4. Novak Djokovic beats Marin Cilic 7-6 (9-7) 6-2
5. Top seed Djokovic is already through to the semis, Cilic eliminated
6. Djokovic tops the group and faces Kevin Anderson in the last four

Zverev seals semi final place with victory over Isner

Watch the best shots from Alexander Zverev's win over John Isner earlier today at the ATP Finals in London, setting up a semi final showdown with Roger Federer.

Semi-finals

Saturday 17 November

14:00 GMT: Roger Federer v Alexander Zverev

20:00 GMT: Novak Djokovic v Kevin Anderson

Alexander Zverev seals semi final place with victory over John Isner

Yesterday's action

Yesterday's action witnessed the conclusion of Group Lleyton Hewitt as Roger Federer and Kevin Anderson advanced to the semi-finals.

Federer secured a straight-sets victory over Anderson to win the group and join the already-qualified South African in the final four.

Although Dominic Thiem was able to defeat Kei Nishikori 6-1 6-4 in the day's earlier game, Federer's win brought both players' tournaments to an end.

Here are some of the best shots from Thiem's win.

Watch: Dominic Thiem's dominant display over Kei Nishikori