It might have been nice to crop the guy out on the left... but then, that would break one of the basic rules of "leave the subject with someplace to go" and since he is moving towards the left, you do need space on the left. Anyway, such is life... maybe another shot in the same location might have been more perfect.
This must have been a challenging shot to take. A few quick notes: never compose a photo with something distracting from your subject. Your eye should be drawn to the subject only and then be able to move around the image. Right now, my eye is drawn to the sideways tree with the ribbon and not the subject. Also, think of your "canvas" as divided into threes. Try to compose the main subject so it shows in one third of your image, not in the dead center. You can fix this by cropping in PhotoShop after the fact if your camera has troubles with focus. Also, the half-cut man on the left doesn't add anything to this image. In the future probably a good idea to crop this kind of thing out. I realize fast sports shots aren't the easiest - esp. in the dark woods. Changing composition like this move your score from a 4 to a 6 or even a 7! Another quick note... although I may be just seeing things incorrectly on my screen (a possibility), the image seems a bit grainy in the darker parts. This may suggest you increased the ISO slightly. YOu may get better results decreasing ISO (for grain factor). My last digital camera used to react like this a bit and I had to keep the ISO at 80, even in dark situations. But I could be seeing things wrong so ignore if this is the case. Good luck in future challenges.