You have no local professional teams. I do. But I have allegiance to MLB leagues. Maybe in MKB All-Star games. NBA, no. And the NFL doesn't even have one.

There is a natural SF-LA rivalry in most matters, but especially in baseball. And the Giants-Dodgers predates the move west by decades.

I think they're at .500 after all these years.

https://en.wikipedia.org/wiki/Dodgers%E2%80%93Giants_rivalry