In the bottom of the 9th
inning, Merkle came to bat with two
outs, and the score tied 1–1. At the time,
Moose McCormick was on first base. Merkle
singled and McCormick advanced to third base.
Al Bridwell, the next batter, followed with a single of his own. McCormick trotted to home plate, apparently scoring the winning run. The fans in attendance, under the impression that the game was over, ran onto the field to celebrate.
Meanwhile, Merkle ran to the Giants' clubhouse without touching second base.
Cubs second baseman
Johnny Evers noticed this, and after retrieving a ball and touching second base, he appealed to umpire
Hank O'Day, who later managed the Cubs, to call Merkle out. Since Merkle had not touched the base, the umpire called him out on a
force play, meaning that McCormick's run did not count.
The run was therefore nullified, the Giants' victory erased, and the score of the game remained tied. Unfortunately, the thousands of fans on the field (as well as the growing darkness in the days long before large electric lights made night games possible) prevented resumption of the game, and it was declared a
tie. The Giants and the Cubs ended the season tied for first place and had a rematch at the Polo Grounds, on October 8. The Cubs won this makeup game, 4–2, thus the
National League pennant.