Mets first baseman Pete Alonso reacts after his seventh-inning home run...

Mets first baseman Pete Alonso reacts after his seventh-inning home run against the Marlins during the second game of a doubleheader at Citi Field on Monday. Credit: Jim McIsaac

The Mets, the hottest team in baseball, returned home Monday to host the Marlins — the worst team in the National League — in a doubleheader.

If the Mets won two games, they would both reach and surpass the .500 mark on the same day.

The Mets won both games.

In the opener, Jacob deGrom allowed two runs in seven innings and drove in two runs himself in a 6-2 victory.

In the nightcap, the Mets got seventh-inning solo homers from J.D. Davis, Michael Conforto and Pete Alonso (the last two back-to-back) to erase a two-run deficit and went on to a 5-4 victory.

At 57-56, the Mets are over .500 for the first time since May 2, when they were 16-15. They hadn’t been at .500 since May 28, when they were 27-27.

The Mets also moved to within 2 1⁄2 games of the Nationals and Phillies (both 59-53) for a National League wild-card spot. They trail the Cardinals by two games and the Brewers by a half-game.

Amazin’! The Mets have won 11 of 12. They are 17-6 since the All-Star break.

“We’re striving toward our goal,” manager Mickey Callaway said. “I don’t think the guys have ever wavered on that — as tough as it’s been sometimes. They’ve always come every single day to accomplish our main goal, and we’re getting closer. We still have a long, long way to go, but it’s fun. The fans were absolutely amazing out there and hopefully we’ll be selling out every game over the next two months and do something really special.”

In Game 2, the Mets trailed 4-2 when Davis led off the seventh with a homer to right-center off Jeff Brigham. It was his 12th.

Two outs later, Conforto tied it with his 23rd homer, a mammoth blast into the upper deck in right. Alonso followed with a line-drive homer to left to give the Mets a 5-4 lead. It was the rookie’s 35th and sent the crowd of 29,645 into an extended frenzy.

Conforto, who was on the 2015 World Series team, said, “That was about as electric as I’ve ever seen it here. I think it all started with J.D. having that great at-bat. And just the energy in the dugout. After Pete’s home run, the dugout, the crowd — it was special.”

Seth Lugo, who clearly has replaced Edwin Diaz as the closer, came in to start the eighth and retired all six Marlins for his second save of the season.

In Game 1, the Mets started deGrom and the Marlins started a rookie with a 9.34 ERA — in Triple-A. Righthander Robert Dugger was making his major-league debut.

So what do you think happened? Pretty much what you would expect to happen. The Mets built a 6-1 lead after five innings and coasted from there.

The Mets were without Robinson Cano, who was placed on the 10-day injured list with what an MRI revealed is a left hamstring tear. The Mets said Cano, who was injured Sunday, will not require surgery. There is no timetable for his return. “It’s devastating,” Callaway said.

Jeff McNeil, who started Game 1 at second base in place of Cano, homered for the third straight game, a first-inning blast on the first big-league pitch thrown by Dugger. It was McNeil’s 14th of the season.

He also singled in the eighth to become the Met to get to 200 hits in the fewest at-bats to start his career. It took him 599, much quicker than Dave Magadan’s mark of 667.

McNeil, who started Game 2 in leftfield, suffered a right calf cramp while chasing down a double in the corner in the third inning and left the game.

Amed Rosario hit his 12th home run, a one-out shot to right-center in the third, to give the Mets a 2-1 lead.

In the fourth, deGrom lined a bases-loaded, two-run single to center to make it 4-1. The Mets added two more runs in the fifth on an RBI single by Alonso and Davis’ sacrifice fly.

DeGrom (7-7, 2.77 ERA) allowed five hits, walked one and struck out eight.

Diaz, who was used in a non-save situation with a four-run lead in the ninth, hit a batter and gave up a walk. With Lugo warming, Diaz struck out Jorge Alfaro looking to end the game.


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