One Game Series?

Aside from the dumb regular season games in Japan, the opening game this year was the Braves in Washington for the opening of the Nats' new ballpark. What was truly strange about this is that each team played a different team in its next game. They played a one game series. Kind of a waste of travel, huh? But then, a one game series really isn't a series because it takes two things to be in series.