The Boston Red Sox are a Major League Baseball franchise competing in the Eastern Division of the American League. The team's home stadium, Fenway Park, opened on April 20, 1912, making it the oldest major league ballpark still in operation. The Red Sox won the first World Series as the Boston Americans in 1903 against the Pittsburgh Pirates. They won their most recent World Series championship in 2004, after an 86-year interval.
The New York Yankees are the Red Sox' chief rival, and the two clubs enjoy one of the longest-standing rivalries in North American sports.