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Nadal and Roger Federer have great respect for each other. I think Novak Djokovic gets under those two guys' skin a little bit, and maybe they don't want to admit it, and I think that's, in a way, healthy.

Federer can be the best ever; he has the potential. The only question is whether he has the desire.

Great champions have an enormous sense of pride. The people who excel are those who are driven to show the world and prove to themselves just how good they are.

My favorite tennis player, who I'm amazed by, is Roger Federer.

An athlete must have ability to reach the top, but many who have ability and who do not live clean lives never have and never will be champions for obvious reasons.

But, then, Sampras won Wimbledon six times and that automatically puts him among the greatest.

I caught the U.S. Open a couple of times, but, man, I would love to catch Wimbledon and watch Nadal - he is the king of all kings.

I'm more in that Rafa Nadal high-energy high-octane mold out there. I wear that emotion on the court. That's how I play my best tennis. People either like that or not. And I can't change that: that's who I am on a tennis court.

Look at Becker and Djokovic. If you look at Novak's record since Boris has been there, it's been phenomenal.

To be a tennis champion, you have to be inflexible. You have to be stubborn. You have to be arrogant. You have to be selfish and self-absorbed. Kind of tunnel vision almost.