Videomaker – Learn video production and editing, camera reviews › Forums › Specialty Topics › Action Sports › Best settings for soccer match filming › For sports, 50fps is good,
For sports, 50fps is good, but your shutter speed is also very important. A faster shutter speed will increase crispness and decrease motion blur which is important for good slo-mo. You can get your shutter speed too fast and it comes out looking sort of strobic. Play around with it before the next game to find a shutter speed/frame rate that works for you.
And I agree that for your purposes, autofocus is the way to go.