"(About “the inability to control emotions, expectations, and tension on the court”) It's my job, and when I'm on the court, I want to do my best, and many times I don't understand that in certain situations I have to play with what I have. If tomorrow I have five, I have to play with five and I can't expect seven. This is what has always cost me throughout my career. It has taken me to a high level, but not as high as I could have gone. It's my limit. [...] Many people say, “You have to learn from Rafa [Nadal], you have to learn from Roger [Federer],” but how can you do that? There's only one Rafa, and there's only one Roger."