There is a notion that a good action photo is all about using a fast shutterspeed and freezing the moment. However, you can break this rule by using a shutterspeed such as 1/60sec or slower. The motion blurs provided by slow shutterspeeds will help you establish the fastpaced nature of the game. You can even experiment with slowsync flash and panning. Additionally, motion blur can help you achieve a clean background, if there is plenty of clutter in the surroundings.