In Game 6 of the 1993 World Series, with the Blue Jays leading three games to two, Carter came to bat with one out in the bottom of the ninth inning with the Blue Jays trailing 6–5 and Rickey Henderson and Paul Molitor on base. On a 2–2 count, Carter hit a three-run walk-off home run off Phillies pitcher Mitch Williams (against whom he had previously been 0–4 in his career) to win the World Series, only the second time a Series has ended with a home run. Upon hitting the home run, Carter jumped up and down many times, most notably while rounding first base, where his helmet came off. Tom Cheek, the Blue Jays' radio broadcaster, called the play: "Touch 'em all, Joe! You'll never hit a bigger home run in your life!"

This Rawlings official American League baseball was signed in blue by Carter and includes a Great Moments COA.