A closer on a team sinking by the day often doesn’t have much to do.

Edwin Díaz had not taken to the mound in six days before he was called upon to secure the final four outs in the 7-3 victory over the Brewers during the second game of a doubleheader at Citi Field on Wednesday.

For all their woes — and the Mets have plenty — Díaz isn’t one of them.

In his past 22 games, he has given up just one run on 10 hits and six walks, while striking out 31.

“I realize it’s been a week since my last outing, but I have figured out how to ensure my body stays prepared,” Díaz mentioned after earning the save. “It has been challenging not getting much playing time because my main goal is to win, and I am aware that if I enter the game, our chances of winning are high. In the past two weeks, I haven’t had many opportunities, but I know my teammates are working hard to set me up for success.”

Díaz was part of a bullpen that tossed 4 ²/₃ shutout innings in the nightcap — including the top of the first by Huascar Brazobán as the opener.

Sean Manaea threw 60 pitches in his first rehab start since a bone chip was discovered in his left elbow.

The left-handed pitcher completed over three innings for Double-A Binghamton, giving up three runs (two of which were earned) on six hits, along with a walk and three strikeouts.

The next step for Manaea, who had previously made four rehab starts and had built up to 62 pitches before the setback, is unclear.

Originally he had been set to pitch Tuesday, which would have lined him up to throw Sunday, but Tuesday’s game in Binghamton was rained out.

Monday is a universal off-day in the minor leagues (and an off-day for the Mets).

“We have a decision there,” Mendoza said.

After his appearance, Manaea told reporters he hoped his next game would be in the majors.

The Mets are also awaiting the return of Kodai Senga from a right hamstring strain and the right-hander threw a bullpen session that went fine Wednesday.

“No news is good news,’’ Mendoza said.

Binghamton’s rainout also pushed back Jesse Winker’s timeline one day in his comeback from a right oblique strain.

The DH hit a homer Wednesday night with Binghamton and is slated to play again Thursday on a back-to-back.

In his fifth rehab game, Brooks Raley threw another scoreless inning, this time with Double-A Binghamton.

Coming back from Tommy John surgery, the lefty has pitched 5 ²/₃ scoreless innings while letting up four hits, walking none and striking out six.

The Mets called up righty Austin Warren as their 27th man for the doubleheader.

The Mets honored Jose Quintana with a tribute video before the start of the second game.

Quintana waved and tipped his cap to fans who cheered him.

Juan Soto stole his 10th base of the season in his 85th game. Soto’s career high for a season is 12.