Staying right by North Station is going to be tough. I know West End Johnny's does a reggae brunch. It's not terrible. The food at Boston Beer Works is a serviceable pre-game meal. Not sure they're open at 10:30, but they'll definitely be open by 11 on a game day.
Are you willing to walk to the North End? There are some decent options over there. Are you looking for something a little nicer? I assume not since you're going to a game, but you never know.