Wikipedia article of the day is Brooklyn Dodgers 1, Boston Braves 1 (26 innings). Check it out:
Article-Link Summary: A 1–1 tie in 26 innings was played by the Brooklyn Dodgers and Boston Braves on May 1, 1920, at Braves Field in Boston, still the most innings played in a Major League Baseball (MLB) game. Leon Cadore of Brooklyn and Joe Oeschger of Boston each pitched 26 innings, also a one-game record. Brooklyn scored its only run in the fifth inning, as did Boston in the sixth, and, though both teams threatened to score again several times, the game remained deadlocked. With darkness starting to fall and no artificial lighting, the umpires called a halt after the 26th inning. Other records included Charlie Pick’s 11 at bats in a game without a base hit and first baseman Walter Holke’s 42 putouts. There have been claims that the long pitching appearances ruined the arms of Oeschger and Cadore; this was not so as both pitched several more years in MLB and Oeschger won 20 games in 1921. Their shared record of 26 innings pitched in an MLB game has been repeatedly cited as one that will never be broken.