The 2013 St. Louis Cardinals season was the 132nd for the baseball team in St. Louis, Missouri, the 122nd season in the National League (NL), and the eighth at Busch Stadium III. On Opening Day, April 1, the St. Louis Cardinals played the 20,000th game in franchise history against the Arizona Diamondbacks, dating back to the start of their American Association (AA) play in 1882. Heading into the 2013 season, St. Louis had an all-time winning percentage of .518.