Another Lax game

My son had another Lacrosse game, and I took more pics. I was using a Canon Rebel XSi, with 70-200 zoom lens. I was shooting in TV mode, 200 iso, 1/1250. For some reason I usually do the best with that. When I try using AV mode, it just won't focus as fast, even on the lowest Fstop. I still feel these could be more focused. Is there something else I can do differently with my settings, or is it just hard to practice the timing, and steadiness of the camera? I was using a Monopod also.........

I wish the cars weren't in the background!

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does the lens have IS? i'd drop the monopod, i get better results without one than i do with one.

I always shoot in Manual. I like to have full control of the camera. Maybe shoot M and choose a higher aperture, it's hard to focus on them when they are moving that fast!