It was yet another nasty outing from the Mets bullpen on Sunday, who surrendered five runs in the seventh to give Washington a 6-1 lead they wouldn’t relinquish en route to victory.

Headlining the disaster was right-hander Anthony Swarzak and left-hander Jerry Blevins.

Swarzak came on to start the frame and walked the first two batters to greet him. He was then removed for Tim Peterson, who allowed a single to Matt Adams to plate Juan Soto, giving them a then 2-1 lead.

Daniel Murphy then came in to pinch hit and dunked a single into right field that plated another. Peterson settled down to get the next two batters, but Blevins was brought in to face the switch-hitting Wilmer Difo, who he plunked with a pitch.

In fact, Blevins beaned the next batter Adam Eaton as well with the bases juiced to force in another run.

Trea Turner then drove in another to make it 6-1 and essentially drove the nail into the coffin.

Swarzak, 32, and Blevins, 34, were expected to be key pieces in the Mets bullpen this year, but have been dismal overall.

The former had a terrific walk year between Chicago A.L. and Milwaukee in 2017, but had a track record of being a mediocre at best pitcher, and that has shone through this season.

The Mets $14 million man has a -0.5 bWAR with a 7.47 ERA and 7.04 FIP in 17 appearances this year. This is after he missed the first two months of the season with an oblique issue.

After having a 2.23 ERA cumulatively last year, Swarzak has been terrible at fooling batters and his put away pitch which was his bread and butter last year has been completely ineffective this season.

As for Blevins, the impending free agent who has been so tough on lefties throughout his career has been lit up like a candle against them this year. In fact, he’s actually been more successful against right-handed hitters (lefties are hitting .333 against him, while righties are hitting .163), but manager Mickey Callaway still insists on using him as a LOOGY.

Regardless, these two pitchers who were supposed to solidify the back end of the bullpen have done nothing more than contribute to the problem.

Blevins likely won’t be back next year and may even get traded in the next couple weeks, but New York is hoping Swarzak, their key winter bullpen addition turns it around for his walk year of 2019. They will desperately need it.