The 1931 Major League Baseball season was contested from April 14 to October 10, 1931. The St. Louis Cardinals and Philadelphia Athletics were the regular season champions of the National League and American League, respectively. In a rematch of the prior year's postseason, the Cardinals then defeated the Athletics in the World Series, four games to three.
This was the first season that the Baseball Writers' Association of America (BBWAA) selected a Most Valuable Player in each league.
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