Japanese tennis player Kei Nishikori successfully started the ATP World Tour Finals with a victory over Swiss Stan Wawrinka 6-2, 6-3 in the John McEnroe Group.
Read moreJapanese tennis player Kei Nishikori successfully started the ATP World Tour Finals with a victory over Swiss Stan Wawrinka 6-2, 6-3 in the John McEnroe Group.
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