HS soccer under the lights

Ok. I purchased the Sigma 70-200 2.8 to help stop the action under the lights at our local high school. Here are a couple of shots from last night's game. Overall, I'm pretty satisfied with it's performance. A couple times it really had to hunt for focus, but I think that is to be expected. I didn't get as many shots as I wanted because of my stupidity of forgetting to make sure all four of my batteries were charged. I guarantee that won't happen again (I hope). Always looking for tips/critiques to get better.

f/2.8 ISO 1600 1/800