Hey Bob,
Before you go to the sporting event make sure you have the right modes set on your camera. ISO 200 (if its a cloudy / dull day set it faster) , Centre focus point, Tracking AF mode, motor drive etc. Make sure all your lenses are cleaned the night before so all you do is rock up on the day point your camera and set your shutter speed and aperture then start taking photos. You will want to be shooting around 1/800th for anything moving.
I am sure there are plenty of other things people can add to this list !!
I find the canon is best if I let it track the subject for a couple of sec before actually taking the photo, you shouldnt have trouble tracking your subject prior to taking a shot or 2 or 10

Enjoy the day Bob ... will look forward to seeing your results !