When I'm relaxed, I play my best tennis.
There's definitely a lack of self-belief in many players, which is the only complaint I have about men's tennis.
Andre Sa is playing close to his potential - maybe even above it.
I'm not the next Kournikova-I want to win matches!
I once played amateur tournament tennis six months without double-faulting.
There are a lot of pretty girls. I am a tennis player first of all, that is why I am here, and if wasn't producing results no one would notice me.
Ninety percent of my game is mental. It's my concentration that has gotten me this far. I won't even call a friend on the day of a match. I'm scared of disrupting my concentration. I don't allow any competition with tennis.
Being world No 1 would be fantastic but you'd like to do it by finishing the year as No 1 without anything happening off the table to someone else's ranking.
If you are happy in your private life, and - that will affect your tennis, and that will help you, actually.
I played tennis when I was younger. I don't know if I could have been a professional, but I am still passionate about it.
I never thought I was going to make a career out of tennis, to be honest, until I was 10 or 11 years old. One of my earliest memories is when I was seven, and I was competing against players that were three, four years older than me. I didn't take it too seriously at the time. I was having a lot of fun.
I don't believe in perfect tennis or perfect matches.
A big upper body is not a great thing for tennis, and for me, flexibility is important.
I don't think you can win a Grand Slam and not be confident in yourself.
I saw Kyrgios down in Australia. He played some very good tennis, won two or three matches, and has done the same here at Wimbledon. I think Australia's got a good prospect in Kyrgios.
I think when you can beat Novak Djokovic in the final of a Masters tournament, you are going to be OK.
I always wanted to be a professional player, but when I started playing well in Challengers and, for the first time, I did well at ATP tournaments, I saw that these guys are also beatable.
Serena is tough to beat; to get over her in the rankings is hard.
Roddick has good presence on the court and has so much adrenalin.
Hopefully I can just have another terrible year with only the one Grand Slam and that will be just fine.
There is no such thing as bad luck in tennis. Just bad technique.
Tennis players shouldn't get married. It hurts your game.
In 2015, there was no chance Djokovic would have an off day.
I've never had big problems about being long on the court. During the U.S. Open I played three events (singles, doubles, mixed doubles) and some people asked me if I want to stay overnight on the court.
Well, I think, you know, the university and the high schools are also important, but depends how I'm going to do in tennis - well, I hope. I mean, it depends, so I don't know yet.
