Originally Posted by Tsaako
The secret is being able to win the game round when you rival is serving. You should be able to win your service games.
When rival is serving hit the X button and aim diagonally across court as soon as rival has served. It slows things down and you can be the one sending your rival wide all the time.
Hope i helped.
I'm still playing this game (as are a few people!) but this tip is what finally got me past that asshole when you have to face him in the Billionaire Birthday challenge thing.