Showers started just before batting practice was scheduled to start, and the rainout was announced just before the scheduled 6:10 p.m. start.
New York's Noah Syndergaard (9-4) and the Cardinals' Carlos Martinez (9-6) were pushed back a day and still start the opener. The Mets' Bartolo Colon (8-5) and St. Louis' Jaime Garcia (7-6), who had been scheduled to pitch Tuesday, will start the second game.
Because of the rainout, both teams will have to scramble to find starters on Saturday, when New York hosts Colorado and St. Louis is at Miami.
The Cardinals also played a doubleheader against San Diego last Wednesday because of a rainout the previous day.
