You just have to have a pretty fast shutter speed with a nice exposure...and you are ready to go.
Because the light doesn't change when they hit the ball, so as long as your speed is pretty fast and still get a a nice exposure while avoiding any blur....you could do the whole game with the same settings.
Depend on the time of the game. If the game takes place around dusk when the sun set really fast and the lights come on, you simply won't have the time.
Uh, yeah you will.
The sun doesn't set in the blink of an eye. If your shots start to get a little underexposed, up your ISO, open your aperture, lower your shutter speed, etc. Whatever you feel is best for the situation, and will render the best images. It's not even difficult to shoot sports using manual. It's more difficult handling your camera and focusing properly than paying attention to what your settings are at.