April 11

From The Met Wiki

1962: The Mets lose to the Cardinals, 11-4, at St. Louis in their first regular season game ever. Richie Ashburn flies out in the Mets' first at bat. Gus Bell gets the Mets' first hit. Gil Hodges hits the Mets' first home run.

1968: Jerry Koosman pitches his first major league shutout as the Mets defeat the Dodgers, 4-0, at Los Angeles.

1971: Jerry Grote hits a home run in the 11th inning to give the Mets a 1-0 win over the Reds at Shea Stadium.

1985: Roger McDowell gets the win in his major league debut as the Mets defeat the Cardinals, 2-1, in 11 innings at Shea Stadium.

1990: The Mets defeat the Pirates, 3-0, at Shea Stadium. John Franco records his first save as a Met.

2005: The Mets defeat the Astros, 8-4, in the home opener at Shea Stadium.

2009: Marlon Anderson is released by the Mets.

2010: Raul Valdes makes his major league debut.