After he's calmed down, you talk with-him about this, right? What does difficult child say? Does he remember it? Make any promises?
My difficult child is getting much better... I'd like to take credit but I think a lot of it is maturity on his part. And he's learning to like being with-his friends and that's often more important than if they win. Does your difficult child have friends on the team that might make it more enjoyable?
Wish I could offer help... maybe start him on some tiny things like board games, win one, lose one, back and forth.
