Don't mean to disagree with your pro, but CONFIDENCE can do wonders for your game. If you get two good wins under your belt with a nice margin (6-0, 6-2 etc.) that means you may be able to go for a bit more in your match. Don't go all out, but it means you can go for a bit more.
Ludacris: My chick bad! Tell me if you seen her. She always brings the racket like Venus and Serena!