What contact sports do you believe qualify under this "sports exception" doctrine for which proof of negligence is insufficient to establish

What contact sports do you believe qualify under this "sports exception" doctrine for which proof of negligence is insufficient to establish liability for injuries sustained during the athletic contest? Is softball a contact sport for players? What about coaching or officiating decisions made in the middle of a fast-moving game? 

How would you decide the case involving PGA golfer Walter Mallin and PGA golfer John Paesani?