Marlins game yesterday. Down on the field where kids run the bases. My niece got run over by a kid, she fell, scraped her knee and bumped head. sue?

No. If any one is likely responsible it is the superivising adult allowing her to participate in the activity, if you now deem the activity to be so dangerous that the Marlins should be held responsible, it was equally so when the supervising adult allowed the child to particpate. This is called assumption of risk. Absent some catatstrophic injury or compelling situation, like she was trampled to death by a ridiculously large crowd of kids (thankfully not the situation), a scraped knee is part of being a kid a participating in any physical activity. As they say here in the south - rub some dirt on it and get back to playing. Be thankful that she wasn't significantly hurt and this should be a learning point for the child to over come adversity and to be careful in such situations.