Interleague play
The Mets – New York Yankees rivalry is the latest incarnation of the Subway Series, the competition between New York City's teams, the American League New York Yankees and the National League Mets. Until Interleague play started, the two teams had only met in exhibition games. Since the inception of interleague play the two teams have met every regular season since 1997, and since 1999 they have met six times each season, playing two three-game series, one in each team's ballpark. From the 2013 season however the number of games was reduced to four, two at each ballpark with the Mets winning six of the last eight games in that span. They have made the postseason in the same year four times: 1999, 2000, 2006, and 2015, and faced off in the 2000 World Series.