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One of the success stories of 2014 has been the rise of Japan's Kei Nishikori who this year reached the world's top ten.

After a good week in London, he has reached the semi finals of the ATP World Tour Finals.

Former champion Michael Chang is the man helping Nishikori to make an imprint on world tennis, and he spoke to Lee James before his match against Novak Djokovic and was asked what it was like being on the tour again, but in a different capacity.

(Photo: Kei Nishikori, Credit: Getty Images)