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Franchised in 1977, the Mariners are a member of the Western Division of Major League Baseball's American League. Mariners play their home games at the Safeco Field.
The Boston Red Sox are a professional baseball team based in Boston, Massachusetts, and a member of Major League Baseball’s American League Eastern Division. Founded in 1901 as one of the American League's eight charter franchises, the Red Sox's home ballpark has been Fenway Park since 1912.