The Red Sox defeat the White Sox by a 9 – 6 score in a night game at Fenway Park which takes 4 hours and 11 minutes to complete for a new American League record. The contest is nine minutes longer than the previous longest 9-inning night game.

May 15, 1991 This Day In Baseball

On May 15, 1991 — The Red Sox defeat the White Sox by a 9 – 6 score in a night game at Fenway Park which takes 4 hours and 11 minutes to complete for a new American League record. The contest is nine minutes longer than the previous longest 9-inning night game.

Source:
Baseball Reference May 15

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