Watch five of the best shots from Novak Djokovic's two-set victory over Kei Nishikori at the ATP World Tour Finals in London.
Djokovic, who is chasing a record fourth straight end-of-season title, dropped just two games winning 6-1 6-1 at the O2 Arena.
In Sunday's other group round-robin match Roger Federer plays Tomas Berdych at 20:00 GMT.
Available to UK users only.
Watch live coverage of Andy Murray v David Ferrer on BBC Two from 14:00 GMT on Monday, 16 November.