Alex, I've shot sports for more than 25 years and this issue is easily resolved. Put the body in manual mode, set ISO to auto, set ap to 2.8, set shutter to at least 1/2000 in that high sunny environment. Take a shot and review the exposure histogram using the back LCD. If it shows pegged to the right side then increase the shutter speed until it looks closer to a bell curve somewhat in the middle. Bell slightly to the right is fine. If it's to the left you are under exposed and decreasing the shutter is in order. Once you've got it dialed in, the autoISO will adjust for condition changes like a cloud coming over that reduces the brightness etc...
Oh, you'll get better results lowering your position to the action. Try sitting on your butt or a very short seat.