Blast from the past: WS renews ’80′s NL rivalry

In one way, at least, this World Series is unique in baseball history: We have never had a matchup of two teams that were once division rivals. This is only possible, of course, because the Astros are one of two teams — along with the Milwaukee Brewers — to switch leagues. The Astros were in the National League until 2013. They are the only team in baseball history to have won American and National League pennants.