On September 23, 1908, the Cubs and New York Giants were involved in a tight pennant race. The two clubs were tied in the bottom of the ninth inning at the Polo Grounds, and N.Y. had runners on first and third and two outs when Al Bridwell singled, scoring Moose McCormick from third with the Giants' apparent winning run, but the runner on first base, rookie Fred Merkle, left the field without touching second base. As fans swarmed the field, Cub infielder Johnny Evers retrieved the ball and touched second. Since there were two outs, a forceout was called at second base, ending the inning and the game. Because of the tie the Giants and Cubs ended up tied for first place. The Giants lost the ensuing one-game playoff and the Cubs went on to the World Series.

When were the Cubs and New York Giants involved in a tight pennant race?