NEW YORK — Like a classic revenge movie, the Mets had a message for the Dodgers after they scored a run in the first inning: You score one on us, we score two on you.

Tit for tat.

The messenger, Mets first baseman Pete Alonso, hadn’t hit a home run in 65 at-bats, the longest drought of his career.

Then, with the Mets trailing 1-0 in the first inning, Alonso answered with a two-run home run, putting two runs on the board. The 406-footer, his 10th of the season, sailed into the left field seats, putting the Mets ahead 2-1.

New York never looked back after that.

In the Mets’ 3-1 win on Sunday, starter Kodai Senga delivered another solid performance. He allowed one run on four walks and five hits, striking out five batters in 5 1/3 innings.

The Dodgers put pressure on Senga, but the right-hander found his way out of trouble. He left five runners stranded, forcing Los Angeles to go 0-for-4 with runners in scoring position.

Entering Sunday’s series finale at Citi Field, Mets pitchers had held the top three hitters in the Dodgers’ lineup 3-for-29. And then, Senga’s Japanese compatriot, Dodgers DH Shohei Ohtani decided to wake up.

Ontani took the second pitch of the game deep into the second deck in right field to put Los Angeles ahead 1-0. It was the first home run Senga allowed since his first start of the season, against the Miami Marlins on April 1.

The Dodgers threatened to score more runs in the first, but Mets center fielder Tyrone Taylor had other ideas.

With runners on second and third and no outs, Dodgers catcher Will Smith hit a shallow fly ball to center. In one motion, Taylor made the catch and threw home, his body falling to the ground from the force of the throw, catching Mookie Betts trying to take home after the out.

The Mets carried that momentum into the bottom of the first. After right fielder Juan Soto got on first on a fielding error by the third baseman, Alonso delivered his home run to give New York the lead.

The Mets added another run in the third inning to extend their lead to 3-1. New York led off the inning with consecutive singles, then Soto grounded into a forceout at second base, allowing a run to score.

A pair of Mets relievers followed Senga with 2 2/3 scoreless innings before handing the ball over to right-hander Reed Garret, who locked up his first save of the season.