Perhaps you'd like to encourage your child to be more of a team player by yelling at him when he seems to hog the ball during a game. Offer a pro/con style of constructive criticism, praising all the great things she does with the ball, but giving her the understanding of how great her team can be when they function as a team. It is important to allow kids to experience their own successes and failures - he may not make the team, and it's not your job to call up the coach and go off on him. Instead, encourage the child to obtain pointers from the coach so he can improve and make the team another time. Sports should be fun, and parents should be there to ensure it stays fun.