After the year you've had, what do you feel about the "Project 45" nickname?

"Having that as my first goal was great for my career. It's not easy to aim for top 10 when you are 18 [years old], so it was a great goal for me. It took some time to get there, but I'm very proud that I'm now one of the best players in Japan."

One of the best? Think the rankings say you are the best.

[smiles shyly]

You came agonisingly close to becoming the first Asian man to win a singles grand slam title. How do you feel about that now?

"I was really disappointed I couldn't play good tennis in the final because I was playing really well for two weeks and then in the last match I couldn't. But I needed a little more experience as I got a little bit tight in the final. Marin [Cilic] played really great tennis, so I couldn't really do much. But after that I won two tournaments in Asia. The next goal is to win a grand slam, but I know it's not easy to go even to the semis or final, so it may take some time but, hopefully, I can reach a grand slam final again."

What more do you have to do to climb that final hurdle?

"I need a little bit more of everything. I need a little more experience, you have to be ready mentally to play seven best-of-five-set matches, that's not easy. My body has to be a little stronger to try to play a couple of five sets in two weeks."

Why do you think Asia still does not have a men's singles grand slam champion?

"It's a good question. I don't know, too [smiling]. I really don't know. I know there are lot of talented players in the juniors, but when they get older ... I don't know. For me, it was great that I [moved to] live in the States, and I got a lot of good practice and travelling wise it was a lot easier than staying in Asia."

Do you think you can end Asia's wait next year?

"I won't say next year but, hopefully, I can make a grand slam final again in the next couple of years and win it."

How do you make sure your slender build does not hold you back against the big six feet [1.83 metres] plus rivals?

"It's not easy to play the big guys, especially since I'm one of the smallest guys on tour. But you see David [Ferrer] has been in the top five ... But I have the advantage of good footwork. I have something that they don't have. That's the fun things for the tennis. I am improving a lot of my weaknesses. Sometimes I feel it's not easy, but I always try to enjoy [the battle] and try to find a way to do what I have to do. I am faster than other players and I can get to a lot of balls. They have big serves, much power, they can finish points with one or two shots. For me, it's not like that, but I still enjoy matching up to them."

Now that Li Na has retired, you are the torchbearer of Asian tennis. Do you see that as a positive or would you have preferred not to have that added pressure on your shoulders?

"I'm okay. It was very sad to see her retire because what she's done was amazing for Asian tennis. Also for me, I got a lot of confidence from seeing her play great tennis and winning grand slams. Hopefully, I will be in her position soon. Hopefully, there will be more Asian players coming up and I can give them confidence as well."

How has your life changed since the US Open?

"A lot of people in Japan now recognise me, even in the US some people recognise me - I never had that before. It's a great feeling. Feel like I'm famous! It's not like I want to be famous but it's a great motivation for me. If you have good attention, you feel more excited. When I go back to Japan, it's not easy as it is not as relaxing [as before], but I try to enjoy the moment."

Can you walk down the street in Japan without being stopped or recognised?

"Not really, ha ha ha - after the US Open it's difficult. But I always try to enjoy it [the attention]. I live in the US, so I know it's not always so I try to enjoy it when I'm in Japan."

When Roger Federer asked to hit with you at Wimbledon in 2007, what did you think at the time? Did you pick up any tips?

"When I was young he was my idol, so it was an exciting moment. He's the best player in tennis history, so I was very excited and very nervous. The excitement was amazing."

You were born six months after your coach Michael Chang won the French Open in 1989. Have you ever seen a recording of it and what did you think?

"I saw Michael's win on video. It's incredible that he won a grand slam at 17. Now it's almost impossible to win a grand slam when you are young. It's amazing. We play kind of similar tennis, so there is a lot to learn from him."

What more can Michael do to improve you as a player?

"We are spending more time on the court together and mentally he's giving me a lot of good tips, changing some techniques. [As a result of his coaching], I am trying to be more aggressive than before and come in a bit more."

You were tagged "Project 45" - once you've finished with your career, what tag will be given to the next Japanese prodigy?

"For sure my best ranking, I want them to pass me for sure... but I know the tennis tour is very tough. Top 10 should be one of the first goals for every player."

Maybe "Project 1"?

"Ha ha ha, I hope so. I want them to beat my best ranking for sure."

Apart from playing in the Tour Finals, is there anything else you want to do while you are in London?

"London, uhm ... shopping? Ha ha ha, is that a good answer? I love shopping. I like shopping for clothes, but I think I have to stay focused."