The Mets and Royals have played a historically few amount of times leading into their 2015 World Series matchup. In fact, the only team that the Mets have played less in the interleague era is the Chicago White Sox, as New York has played the Royals nine times and the White Sox only seven times.
The biggest distinction for the Mets and Royals is about how successful of expansion franchises they have been. The first three pennants won by expansion teams were won by the Mets in 1969 and 1973 and the Royals in 1980. In 1985, the Royals became the second expansion team to win a World Series, following the Mets’ 1969 title. The next season, the Mets became the first expansion team to win a second World Series.
Here are the lifetime matchups of the Royals and Mets:
2002: Three games at Shea Stadium with the Mets winning two of three
2004: Three games at Kaufmann Stadium with the Royals winning two of three
2013: Three games at Citi Field with the Royals winning two of three