Who says Citi Field can’t be a hitter’s paradise?

The park normally known as a windy cavern became the site of a home run derby, at least for a day.

But after crushing five solo shots, the Mets reverted to the offense they were built to thrive on and strung together hits that stayed in the park to outlast the Nationals in wild fashion, 6-5, at Citi Field on Saturday afternoon.

Keon Broxton played hero, lining a single to right field with two outs in the bottom of the eighth inning to bring home Michael Conforto as the winning run. Conforto had doubled before pinch-hitter Jeff McNeil was hit by a pitch, bringing Broxton to the plate against Tony Sipp to complete the comeback after trailing 5-3.

“That was just an incredible team win,” said Pete Alonso, who hit back-to-back home runs with Robinson Cano to start off the eighth inning. “All of just put together quality at-bats and just kind of had a will to win. Never count us out.

“Like the Mets saying is, you gotta believe.”

Both bullpens tried to give the game away, but Edwin Diaz finally nailed down the save with a perfect ninth inning to give the Mets their first home win of the season on a day that started with Steven Matz tossing five scoreless frames.

Jeurys Familia had blown a 3-2 lead by giving up a pair of homers in the top of the eighth, but Alonso and Cano were quick to have his back with their back-to-back blasts to tie the game at five in the bottom of the inning.

Five batters later, Broxton got to the plate trying to pull the ball on his first swing, but whiffed. Then he heard Cano in the dugout telling him to go the other way to right field, so he obliged, lofting a line drive over the second baseman’s head.

“Everyone has the mindset that we’re going to win every game, no matter what the score is at any inning or anything like that,” Broxton said.

J.D. Davis blasted two solo homers and Conforto added another to put the Mets ahead 3-1 after six innings. The Mets’ five home runs on Saturday were one more than they had hit in the first seven games of the season.

Familia had put out a fire, not of his own doing, in the seventh. He replaced Justin Wilson with two outs and runners on first and second, but his second pitch got past Wilson Ramos for a two-base passed ball. He didn’t see the ball until it was too late as Victor Robles raced around from second to score, making it 3-2.

But the former closer reignited the flame and tossed gasoline on it in the eighth, serving up a solo home run to Anthony Rendon that tied it and a two-run shot to the light-hitting Wilmer Difo that put the Nationals ahead 5-3.

Pitching coach Dave Eiland then came out to meet with Familia after Difo’s homer and became a fortune teller.

“Eiland said, ‘Get this guy here and we’re going to win,’” Familia said.

The boos that rained down on Familia after he struck out Victor Robles to end the top of the eighth inning, though, were soon replaced by boisterous cheers when his teammates picked him up with their bats.

“These guys are unbelievable,” manager Mickey Callaway said. “This game was everything we talked about all spring training. You gotta pick your guy up in front of you. … It’s that never-say-die attitude that these guys are playing with.”