Martinez will start at designated hitter and bat sixth Wednesday in Game 3 of the NLCS versus the Dodgers.
Jesse Winker was in the DH slot in each of the first two games of the series, but Martinez will get a shot Wednesday against right-hander Walker Buehler. It's Martinez's first start since Game 4 of the NLDS and his fourth start in 10 games this postseason for the Mets.