How do you feel about me being so happy that I won the game for my team?
That must be exciting, were you nervous?
Yeah, it was a hard game, I always have butterflies in my stomach before important games.
It is ok to be a bit nervous before important games. You should also recognize the entire teams effort for success.
No, I wasn't nervous at all and I played better than anyone else.
You really don't have to worry about feeling nervous before something so important to you. It is completely normal and everyone goes through that.