Roger Federer improving at 37 is unbelievable, says Kei Nishikori

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Roger Federer improving at 37 is unbelievable, says Kei Nishikori

Kei Nishikori is set to make his fourth appearance ever at the ATP Finals in London. The Japanese player replaced Juan Martin del Potro in the draw and ahead of the event, he spoke about his level and condition. 'It was a little bit lucky because I was not in the top 8', Nishikori said about qualifying for the ATP Finals.

'However, I am very happy. The first goal this year was to break the top 10. I played a very good tennis, especially for two or three months. Especially in Vienna and Paris, quite a convincing tennis.' About his fitness, Nishikori - who dealt with a wrist injury last year - added: 'Some days are better some days less.

But there are just a few signs or pain, it almost disappeared. Recently, I think that it is becoming a pain-free body.' Commenting on his tactic against Roger Federer on Sunday, Nishikori added: 'I did not win a set in Paris and Shanghai, so I have to change something.

As a first match, this is difficult, but I want to give my best. It's incredible that Federer keeps improving. He is very fit and he is physically very good. He keeps being a hard opponent for me. I always like to play against him because it's a challenge and I like challenges, but I have to play at 100 per cent to win on Sunday.' Meanwhile, Alexander Zverev was asked if there were days in the last years where he did not think about tennis.

'Oh, yes', said the world No. 5. 'On holiday. Or on the days where I travelled with friends and Simply enjoyed. I am okay with not thinking about tennis.' ALSO READ: Rafael Nadal: Worse players than David Ferrer won a Grand Slam title