Replying to Filming Lacrosse?

My friend wants me to film his lacrosse games this spring, has anyone had experience filming lacrosse? Im already pretty familiar with the game, and I'm not buying new equiptment right now (i have a t2i setup). I was just wondering if anyone has done it and knows anything to make it easier or get better shots. Also, just focusing on one person in lacrosse seems more difficult than in skiing or action sports, any tips on this? Thanks