With the New York Giants leading 7 – 0 after two innings, the Washington Senators start delaying the game in hopes that the imminent rainstorm will wash the game out. Umpire Tom Lynch forfeits the game to New York.

On May 3, 1897 — With the New York Giants leading 7 – 0 after two innings, the Washington Senators start delaying the game in hopes that the imminent rainstorm will wash the game out. Umpire Tom Lynch forfeits the game to New York.

Source:
Baseball Reference May 3