I could be wrong but when doing sports photography I'm always thinking about the following trade off:

• A fast shutter speed to freeze the action.
• A large(r) aperture to increase DOF and thus counter focusing errors due to the fast action.

What would you consider to be optimal settings in ideal circumstances. And what compromises would you make if conditions are sub-optimal (less light). Compromises would be: slower shutter speed, smaller aperture, higher ISO.

What I'm aiming for are sharp images of people running around in games such as soccer, ultimate frisbee.