Manager Mike Matheny named Wong to the 2013 Cardinals' postseason roster. He played in seven total games between the National League Division Series (NLDS), National League Championship Series (NLCS) and World Series. He made his World Series debut in Game 3 against the Boston Red Sox as a defensive substitution and collected a hit in the bottom of the eighth inning in his only Series plate appearance. Wong also appeared in Game 4 when Matheny inserted him as a pinch runner in the ninth inning. However, Boston closer Koji Uehara picked him off first base for the final out of the game, the only occasion in which a World Series game ended on a pickoff play. Boston won the game, 4–2, and went on to win the Series, 4–2.