Tennis

I shot tennis Wednesday afternoon. I only got a few good pictures because a lot of things were out of focus because it would focus on the background. My ISO was 400 my aperture was 4.0 and my shutter speed was 1/1250. I hardly didn't get anything. I did crap! I have just been doing terrible. I'm so frustrated. I just didnt get one good picture. This is the closest I got.