In what’s been a throwback year for Luis Severino, the right-hander delivered his best performance of the season with his first shutout since 2018 in a 4-0 win over the Marlins on Saturday at Citi Field.

It came complete with chants of “Sevy” from the Queens crowd, as Severino recovered from three straight poor performances to dominate Miami, which has the worst offense in the National League.

That hardly mattered to the 30-year-old, whose career was in shambles less than a year ago following a calamitous final season in The Bronx.

Since then, he’s refined his repertoire, cut down on tipping pitches and become a better pitcher and it culminated Saturday.

Severino called his season “amazing.”

The Mets offense scored a run in each of the first four innings to give Severino a cushion, sparked by a leadoff homer by Francisco Lindor and a blast by Pete Alonso to start the bottom of the second.

Severino took care of the rest, as he took advantage of Miami’s aggressive approach at the plate and was able to keep his pitch count down in the first complete game shutout by a Met since Jacob deGrom tossed one against Washington in 2021.

Severino waved to the crowd as he walked off the mound following the eighth, having thrown 94 pitches, but he and Carlos Mendoza had a conversation — two, actually — between innings and Severino convinced the manager to keep him in the game.

“I wanted to see how he was feeling,” said Mendoza, who has a long history with Severino from their time with the Yankees. “He just looked me in the eye and said he was good.”

Mendoza then followed Severino down to the batting cages below the dugout.

“I wanted to make sure,” Mendoza said. “I wanted him to be honest. I told him, ‘Give me everything you’ve got.’”

Then Severino drilled Jake Burger with his first pitch in the ninth and Mendoza went to the mound.

The Citi Field crowd booed, thinking Mendoza was going to pull Severino for Edwin Diaz. But with Severino’s velocity still up, Mendoza let him go batter-by-batter, telling him, “This is your game.”

Severino responded by getting the next three outs to finish it.

It was an important outing for Severino for a number of reasons.

Perhaps most significantly, it came after three of his worst starts of the year.

Heading into Saturday, he’d given up 15 runs — 14 earned — in 13 innings, along with five homers as his ERA jumped from 3.58 to 4.17 in the three rough outings.

But on Saturday, Severino mostly cruised, throwing a season-high 113 pitches. He struck out eight and walked just one.

And for a rotation that’s struggled to provide length recently, Severino’s complete game followed Sean Manaea’s seven-inning outing on Friday, which gave the bullpen a break.

The Mets have won consecutive games since dropping five of six and can finish off the series sweep Sunday.

After the Marlins leave town, the Orioles come to Citi Field before the Mets begin a critical road trip in San Diego, with Arizona to follow.

Their wild-card hopes may ride on the next three series, so it was vital they beat up on the Marlins, especially after dropping a series to Oakland.

Having Severino get back to the form he showed earlier in the season will be key.

He’ll likely never approach the dominance he showed in his early years in The Bronx, but he’s a proven commodity who has pitched in big spots before.

Asked if he could be the ace of the staff, especially with Kodai Senga’s return from a strained calf not guaranteed, Severino demurred.

“We need everybody,’’ Severino said.

And on Saturday, he delivered.