You can kick a ball into the net, throw a basketball into the net. Tennis is complicated. It'll make a lot of great athletes run the other way because they can't be successful initially.

What separates the winners from the losers is that they can deal with doing their best while still coming up short.

Getting to number one in the world without a coach is highly unlikely.

When your four biggest tournaments all operate relatively independently, and the ATP and WTA tour operate independently, and you have Davis Cup and Fed Cup that operate independently, it makes it a tough message.

Focusing on one thing can be tough, and people with fewer options are more apt to concentrate on what they're doing. There's probably something to hunger.

If you don't want to practice, unless you have a hard-nosed coach, you don't have to.

You have to look at each tie and look at what your options are.