A fast lens you will need and more than one. With the access you have a lot of good pictures can be had during practice and warm up. A lens for close ups. group photos, etc. Being in the right position to take the kind of photos you want takes some thought.

You made the comment the k10d is not known for sharp processing ? Did you mean fps The k10d is not the fastest in fps but from those who have used it seemed to think they had more keepers. The card you use is also important. You want a card with a fast buffer. Machine gun shooting can be helpful at times but does not replace anticipation of action.

Good luck in you endeavor. It's been a long time since I shot sports in the film age.