Federer v Nishikori: Five great shots

Watch five of the best shots from Roger Federer's victory over Kei Nishikori at the ATP World Tour Finals in London.

The Swiss six-time champion came through 7-5 4-6 6-4 to claim his third round-robin victory at the O2 Arena.

Federer, 34, had already won the group and will be joined in the semi-finals by Novak Djokovic or Tomas Berdych.

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