There are many circumstances when you can sue if your child was hurt playing a sport. This includes pick-up games, school sports, and other organized sports.
To win a case against an organized sports league, you must prove that the league organizer was negligent in causing the injury. For example, failing to secure a soccer net that falls on a player or having a hazard on the playing field. You may be able to pursue a claim even if you signed a waiver when you signing up your child up to play in the league.