Tied with the Dodgers at the end of the season, the Giants played a three-game tie-breaker series with Brooklyn to determine the NL pennant winner. In the deciding Game 3, with the Giants trailing 4–1 in the ninth inning, Dark led off with a single against Don Newcombe. As Dark recalled, "I must have fouled off six or seven pitches with two strikes before getting that hit." He then scored three batters later on a Whitey Lockman double. Bobby Thomson followed with the Shot Heard 'Round the World, a three-run home run against Ralph Branca that clinched the pennant for the Giants. In Game 1 of the 1951 World Series against the New York Yankees, Dark hit a three-run home run against Allie Reynolds, helping the Giants to a 5–1 victory. He had an RBI single against Vic Raschi in Game 3, which the Giants won 6–2. In Game 4, he had three doubles, though the Yankees won that game 6–2. Ultimately, Dark had a hit in every game of the series, batting .417, but the Giants fell to the Yankees in six games.