On July 18, 1891 — In a North Dakota Red River Valley League contest, the Fargo Red Stockings and Grand Forks Black Stockings each use one pitcher when they play to a 25-inning, 0-0 tie at the State Militia Training Grounds in Devils Lake, a neutral site selected to attract more fans. The umpire abruptly ends the longest scoreless game in history, a four-hour and ten-minute nightcap of a twin bill, after the bottom of the 25th to allow the players to catch a train.
Source:
Baseball Reference July 18