What is described is far from ordinary care and borders on reckless. Ordinary care requires that when your actions or conditions prove to present a hazard, it is incumbent upon you to modify your behavior.
Definition of ORDINARY CARE. : the care that an average reasonable man exercises to prevent harm to the person or property of others and failure to exercise which when under a duty to do so constitutes actionable negligence on the part of one causing such harm.
That's one definition. There's also Duty of care, n. a requirement that a person act toward others and the public with watchfulness, attention, caution and prudence that a reasonable person in the circumstances would.
The legal test is the "reasonable" part: a reasonable person can see that a baseball/softball diamond being used properly will have balls leaving the playing field. There's nothing unreasonable or reckless about playing ball, sorry.