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Novak Djokovic of Serbia plays a forehand against Kei Nishikori of Japan during Day 1 of the ATP World Tour Finals at O2 Arena in London. Getty Images -
Kei Nishikori of Japan against Novak Djokovic of Serbia during Day 1 of the ATP World Tour Finals at O2 Arena in London. Getty Images -
Serbia’s Novak Djokovic celebrates after winning the first set . Reuters -
Novak Djokovic of Serbia receives the ATP World Number 1 Award. Getty Images -
Simone Bolelli and Fabio Fognini of Italy in action in their men’s doubles match against Jamie Murray of Great Britain and John Peers of Australia. Getty Images -
Jamie Murray of Great Britain and John Peers of Australia. Getty Images
In Pictures: Novak Djokovic shines against Kei Nishikori on Day 1 of the ATP World Tour Finals at O2 Arena in London
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