On a night Kodai Senga again relied heavily on his ghost forkballs, it was the Mets’ offense that was disappearing.

The Mets have struck out 28 times and scored one run in two games against the Nationals, making the division-worst club look like the team with two future Hall of Famers in its rotation.

Buck Showalter’s crew has dropped four straight in April after never losing more than three in a row last year, the latest a 4-1 defeat to Washington in front of 20,191 frustrated fans at Citi Field on Wednesday night.

One night after Josiah Gray kept the Mets scoreless for six innings, MacKenzie Gore threw six, one-run innings in which he allowed four hits and punched out a career-high-tying 10.

The Mets went 1-for-8 with runners in scoring position and lacked both hits (just four) and big hits (none in the bottom of the seventh, when the Mets’ best threat arrived).

In the inning, the Nationals went to righty Carl Edwards Jr., who walked pinch-hitters Brett Baty and Daniel Vogelbach. With the Mets down two, Brandon Nimmo’s ground out to first moved the runners over, the tying run at second base.

But against Hunter Harvey, the struggling Starling Marte swung through a 99 mph fastball and Francisco Lindor chased a diving splitter, Mets fans booing a team that has stopped hitting.

Marte and Lindor had come to the plate with two runners on in the fifth inning, too, and recorded outs in succession. After a long West Coast road trip, the Mets and their best bats have returned home flat.

The Mets (14-11) already have lost the series with the Nationals (9-14) before the Thursday finale, and they are hardly looking like a team ready for the Braves to invade next.

The Mets’ 1-through-5 hitters combined to go 1-for-19 with a walk and eight strikeouts, their only hit an RBI single from Marte.

Until a third-inning run — on an Eduardo Escobar hit to right that outfielder Lane Thomas misplayed into a triple, followed by Marte’s RBI knock — the Mets had gone 14 straight innings without a run. Following that frame, the Mets went six straight innings without a run.

With the Mets’ bats silent, Senga had to be perfect, which he was not. In his first year in the majors, the righty is proving he can pitch well, but he has yet to prove he can pitch well for long.

Senga allowed two runs in five eventful innings in which he consistently navigated around traffic. He allowed five hits and four walks but was nasty when he needed to be, consistently relying upon strikeouts (seven) to escape jams.

In five starts this season, Senga has completed six innings only once and needed 94 pitches to claw through five Wednesday.

The Nationals tagged him for a pair of runs in the second inning, when a Keibert Ruiz walk, Dominic Smith double and a swinging bunt from Lane Thomas scored one run.

With runners on first and second, CJ Abrams bounced an RBI single past a drawn-in Escobar to put the Nationals up 2-0.

Senga proceeded to strike out Victor Robles, Alex Call and Jeimer Candelario to get out of the inning. Those would be the only runs Senga surrendered, but there were no easy frames.

Two innings later, Senga walked Thomas and allowed a single to Abrams. With two on and none out, Senga struck out Robles and Call before inducing a ground out from Luis Garcia.

The Nationals tacked on runs against Jeff Brigham in the seventh (a Candelario solo home run) and Adam Ottavino in the eighth (a single from Call that drove in Robles).

Those clutch hits brought the gap to three runs, which is a mountain to the Mets these days.