It does take a great hunger to be successful at anything.
If you don't want to practice, unless you have a hard-nosed coach, you don't have to.
Tennis is still very successful in spite of itself.
Hell be lucky to last five or six years on those knees. What it might have to come down to is playing less on hard surfaces and playing more on forgiving surfaces.
Flying has opened up new horizons for tennis.
I am there to play tennis and represent the U.S., but I'm also aware that not everyone's going to be able to think that way.