Power
If you're anywhere near the top of the heap, the power is pretty great. You're a world-famous athlete, which always has its perks. You'll probably get a lot of freebies from people who are just excited to have met you or have you walk into their restaurant, and you shouldn't have too much trouble in the courting department.
But man, the real power comes when you're on that court. That feeling of murdering the ball and seeing it go low over the net, watching it graze the baseline, crushing your opponent into submission, and most of all, the power of being able to play a game you love and not having to wear a suit and tie to the office every day. That's power, baby.