The Mets have played postseason games against 13 different teams, with 16 teams that they haven't faced. Possible first-time opponents this year are the Phillies, Padres, Brewers, Blue Jays, Mariners, Guardians, Rays, and White Sox. Possible repeat foes are the Cardinals, Braves, Dodgers, Yankees, Astros, and Orioles. Here are the teams the Mets have played: Arizona Diamondbacks (1999 NLDS win) Atlanta Braves (1969 NLCS win, 1999 NLCS loss) Baltimore Orioles (1969 World Series win) Boston Red Sox (1986 World Series win) Chicago Cubs (2015 NLCS win) Cincinnati Reds (1973 NLCS win) Houston Astros (1986 NLCS win) Kansas City Royals (2015 World Series loss) Los Angeles Dodgers (1988 NLCS loss, 2006 NLDS win, 2015 NLDS win) New York Yankees (2000 World Series loss) Oakland Athletics (1973 World Series loss) San Francisco Giants (2000 NLDS win, 2016 Wild Card loss) St. Louis Cardinals (2000 NLCS win, 2006 NLCS loss)