 The regular season ended on September 30, extended one day for a one-game playoff between the Tampa Bay Rays and the Texas Rangers to decide the second American League Wild Card winner.The 2013 season was the first with the Houston Astros as a member of the American League (AL) in the West Division.This marks the first growth in the number of American League teams since the 1977 Major League Baseball expansion added the Seattle Mariners and Toronto Blue Jays.