When you are relaxed, you can focus a lot more easily than when you are hyper and over-energetic. It's important to be "up" for a competition, but you shouldn't have too much energy, because you might not be able to control it. In competitions, it is important to be able to bring the power and energy you are feeling down to a level that you can control. This comes with practice and experience.
Elvis StojkoJust before I got down here I had a chance to see Agassi play another game and he smoked another player, which was nice to see. Someone who a lot of people thought couldn't come back and now he's winning.
Elvis Stojko