PCSPounder
Stadium Groupie
Xolo de Tijuana is not a MLS team but a club in Mexico. I don't think it should be listed by San Diego.
So these markets have serious linkage (for instance, recent reports about Americans who work in San Diego and have taken residence in Tijuana because the cost of housing is considerably lower) and there's a soccer league bigger than MLS located in the conglomeration.
It matters.