All field sports are going to be better shot in AI Servo mode, as the players will be running. One shot mode is going to give OOF images.
I almost always use single focus point (manually selected), and I'll pick one above the center line of the frame in good light to get it on a face if possible. Most field sports are shot at a distance and DOF is not generally so thin that focus on the face is as critical. It's nice to have, but otherwise a solid on-body focus is often good enough.
I tend to use M mode for sports. I get my exposure set for the atheletes and then I don't have to worry that differing backgrounds will fool the meter and ruin the exposure. Av or Tv modes can certainly work though.....since you know you will always have the subject centered in sports shooting I do suggest center weighted average metering when you use these modes.
Finally, unless your camera goes to 8+ fps do not expect a fast frame rate to catch peak action in a play. Learn to anticipate and you will get that one perfect shot more often. 3 to 6 fps can often simply deliver a handful of shots that each have missed the best moment.