 For this season, each team played 20 interleague games (up from 15-18 games in 2012) in eight series.Each team played one three-game series against four teams from one division in the other league, and two two-game series (one home, one away) against the remaining team in that division (for 2013 the match-ups are AL East vs. NL West, AL Central vs. NL East, and AL West vs. NL Central, meaning the changes of the Astros and the small increase in interleague play will not affect the yearly rotation, also the Astros played all of their former NL Central rivals in 2013).The remaining four games were played against a team's "natural rival" in two back-to-back two-game series from May 27–30.