Unless you can show the park failed in some duty, probably not. If the pitch was way, way too fast or the ball was other then a regulation baseball, maybe. Most courts would say the you assumed the risk. Businesses are not liable just because someone is injured on the premises. There must be a causal link between the injury and a failure to act to prevent a known hazard. If you were holding the bat improperly or in an uncommon fashion, odds of sucess fall further.