There's a reason why you won't find a professional sports photographer, especially for for paper or wire service, shooting f/9 action shots. There is absolutely nothing wrong with a 1/5000th shutter speed. It's just the name of the game when shooting wide open in direct sun. Certainly, stopping down can give you some benefits in a sport like soccer, and it will extend your margin of error with focus, but to do so only because you feel like the shutter speed is "too high" isn't necessary. I'll stop down to f/4 sometimes, but rarely slower... again, it just isn't necessary to stop down beyond that for action shots. If you still can't grab sharp focus at f/4, then you should be checking your technique or equipment, not stopping down further.
OP, many of your shots are underexposed, looking at the faces. Part of that, as others have mentioned, is due to you position to the sun. When forced to shoot side to backlit, don't be afraid to blow out those white uniforms quite a bit in order to get the face properly lit. You can always recover highlights and bring up the shadows in post... shoot raw if you aren't already. During these direct sun games, experiment with position. Shooting directly backlit can yield awesome shots if done right. For now though, I'd stick with putting your back to the sun whenever possible. Don't know what metering mode or method you're using, or if you're in manual mode or aperture/shutter priority... those details are always nice. As far as focus, again, details on your settings/technique would be nice. Looks like you just backfocused on the background in #4. The images are really too small to really see what is/isn't in focus.White balance looks a little off in a few, but that shouldn't be a problem if you're shooting raw.
Also, crop tighter if you can.