Me, personally, I use single point, and have a pre-registered point on the other side of the viewfinder. For example, I shoot from around center ice, so when the team I am tracking is moving from right to left, I use a single point focus far on the right side, with a pre-registered point on the left. This allows me to capture a person if the enter the frame from the left side of the viewfinder, and also allows for some viewing space in case the player quickly passes the puck. I follow a player with the right focal point, and then if I need to switch to a player on the left side of the frame, or if I pan over and something is happening on the left side, I switch over to the other point to capture action from that side.
I also tend to use the joystick frequently to move around that focus point. I find that AF point expansion doesn't span out far enough as I usually jump about two squares over. It also depends on what target you are focusing on, and the angle you are shooting at. Also make sure you are using AI Servo as that will help.
Feel free to PM with any other questions you have. Make sure to post some shots as well, so myself, and others, can help you in the fine details. Those are the things that will help you really grow and learn.