Watch five of the best shots from Kei Nishikori's victory over Tomas Berdych at the ATP World Tour Finals in London.
The world number eight let an early lead slip and saved a break point in the decider before winning 7-5 3-6 6-3 at the O2 Arena.
The Japanese had lost to Novak Djokovic in his opening round-robin match, while Czech Berdych lost to Roger Federer.
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