The Mets began the regular season on March 28, 2019, facing the Washington Nationals away at their home opener, winning 2–0.

However, the rest of the month proved to be a rollercoaster of wins and losses with division rivals such as the Washington Nationals and Philadelphia Phillies, along with splitting a series with the Atlanta Braves.

[3] On July 28, the Mets traded pitching prospects Anthony Kay and Simeon Woods Richardson to the Toronto Blue Jays in exchange for Marcus Stroman.

[5] On August 18, Pete Alonso hit his 40th home run of the season in an 11–5 win over the Kansas City Royals, setting a new National League record for home runs in a season by a rookie, breaking the previous record of 39 by Cody Bellinger in 2017.

This is also the first time any MLB rookie has set a franchise record for home runs in a season since Johnny Rizzo did so for the Pittsburgh Pirates in 1938.

[7] The Mets' wild card chances took a hit after back-to-back series sweeps against the Atlanta Braves and Cubs,[8] but the team closed out the month with two consecutive wins against the Philadelphia Phillies.

On September 27, Alonso hit his 52nd home run of the season off of Braves pitcher Dallas Keuchel, tying Aaron Judge's rookie record set in 2017.

The Mets went 46-26 after the All-Star break, which was the second-best record in the National League behind only the Los Angeles Dodgers (46-24).

Infielders Other batters Coaches Note: Team batting and pitching leaders in each category are in bold.