I agree with this as well, also soccer is a pretty fast game, 1/640 should be a minimum. Sacrifice the other settings to get this in my opinion. Stopping the action is key to a good sports shot.
It seems you've got an eye for the action, I'd almost guess you probably played soccer quite a bit, thats a definate bonus. The only other tips I would give are too watch your crops and backgrounds.
Is there a reason you didnt crop these tighter?
Yes I was actually going to play but I had the camera and wanted to take pictures as I'd left my boots at home. They told me when I turned up that I was playing but I had to say no.
I will try AV next time and maybe centre weighted. I think if I concentrate a bit more next time I'll get some better pictures. I still feel the lens is back focussing slightly as nothing seems sharp. Hopefully it will be warmer to help me keep an eye on the action.