In Game 5 of the NLDS against the Reds on October 11, Posey hit a grand slam off of Reds starter Mat Latos to give the Giants a 6–0 lead and subsequently won the game. The Giants become the second NL team to win a Division Series after being down two games to none and first since the LDS became a permanent standard in the playoffs in 1995. Posey became just the third catcher in MLB history to hit a grand slam in the playoffs, along with Berra and Eddie Pérez. He also completed a strikeout-throw out double play at third base in the sixth inning to help preserve the victory. He batted .154 with four hits and one RBI in the NLCS as the Giants defeated the Cardinals in seven games. He hit a two-run home run against Max Scherzer in Game 4 of the World Series as the Giants swept the Detroit Tigers, giving Posey his second World Series ring.