Since regular-season interleague baseball made its debut in 1997, the Mets and the Yankees have played each other every season.
In the beginning, it was a single three-game series, one year in the Bronx, the next in Queens. It quickly expanded to an annual six-game affair, divided between the two teams’ parks, and was always played on weekends.
On a couple of occasions, rainouts led to the Yankees and the Mets playing spiced-up, day-night, Queens-Bronx doubleheaders, with the teams starting the day at one address and finishing at the other. And in 2013 and 2014, the teams switched to a new format — four games in a row in midweek, two in each stadium.