The Mets have come from behind to win two straight nights against the Phillies, thanks to a team-wide surge from stars like Pete Alonso, Francisco Lindor, Juan Soto to youngsters like Brett Baty and Mark Vientos.

For weeks the New York Mets had been searching for a defining moment in their roller-coaster season.

On Tuesday night at Citi Field, they found it in the bat of Brandon Nimmo, who slapped a walk-off single to left-center to cap another come-from-behind win over the division-leading Philadelphia Phillies.

The 6-5 victory, secured before a roaring crowd of 41,914, pulled the Mets within five games of the top of the NL East and injected new life into a playoff push that seemed to be slipping away just a month ago.

It was the second straight night the Mets spotted the Phillies an early lead only to storm back late, and the second straight night Nimmo played the role of catalyst.

“What we would really like is for things to keep going well into the playoffs,” Nimmo said afterward, his uniform drenched in Gatorade from Pete Alonso’s celebratory dousing.

“I’ve always said the hottest team wins in the playoffs. We’re really happy with the way the offense is playing right now.”

That offense has been relentless. Over the past two weeks, the Mets have led the majors with 99 runs, blending power from the middle of the lineup with timely hits from the bottom third.

On Monday, it was the bench that fueled a comeback. On Tuesday, the stars aligned. Alonso, Francisco Lindor, Nimmo, and Juan Soto — the nucleus the Mets spent heavily to assemble — all contributed in the game’s decisive moments.

The night began ominously. Sean Manaea surrendered a pair of runs in 4⅔ innings before manager Carlos Mendoza turned to a taxed bullpen.

Gregory Soto, Huascar Brazobán, and Tyler Rogers all saw action before Ryan Helsley, shaky for much of the season, took the mound in the eighth. The result was almost disastrous.

After striking out Alec Bohm, Helsley walked Nick Castellanos and then grooved a fastball that former Met Harrison Bader deposited into the left-field seats to tie the game.

The boos cascaded as Helsley left the mound, his ERA ballooning and his role in the bullpen more tenuous than ever.

But Edwin Díaz, pitching for the third time in four days, restored order in the ninth with a vintage performance. The closer mowed down Kyle Schwarber and Bryce Harper with high-octane fastballs before inducing a routine groundout from J.T.

Realmuto. Citi Field pulsed with energy as Díaz strutted off the mound, trumpets blaring once again in the imaginations of Mets fans.

The momentum carried into the bottom of the ninth. Starling Marte singled sharply to right off Phillies closer Jhoan Duran. Alonso followed with a liner up the middle. Brett Baty, pinch-hitting, lofted a single to shallow left that loaded the bases with one out.

With the infield drawn in, Nimmo worked the count before ripping the game-winning hit into the gap. He barely made it to first before being swarmed by teammates, showered in water and sports drink as Citi Field erupted.

“Now we’re getting those balls to find holes. We’re using the whole field,” Mendoza said. “With two outs, not trying to do too much. That’s the key right now.”

The win was not just another tally in the standings. It underscored the resilience of a Mets team that has endured stretches of inconsistency. In April, Alonso and Lindor carried the club.

By June, they had cooled as Soto and Nimmo ignited. Younger bats like Baty and Mark Vientos have been streaky, while Jeff McNeil has provided steady production. For the first time this year, though, every piece of the lineup seems to be clicking in unison.

The turning point came in the fifth inning when the Mets answered back from a deficit with a furious rally. Trailing 2-0 after Harper drove in two runs, the Mets sent 10 batters to the plate.

Luis Torrens was hit by a pitch, Lindor dropped a bloop single, and Soto laced a hard grounder up the middle to drive in the first run. Marte worked a walk that sent Phillies starter Jesús Luzardo into a rage, leading to his ejection after a heated exchange with the umpire.

Alonso promptly ripped a two-run double to put the Mets ahead. Vientos followed with an RBI single, and Nimmo added a sacrifice fly to stretch the lead to 5-2.

Though the Phillies clawed back, the Mets refused to let the game slip away. That kind of resolve has defined their resurgence in August.

The victory also extended New York’s dominance over Philadelphia at Citi Field. The Mets have now beaten the Phillies nine straight times in Queens, including Games 3 and 4 of last year’s NLDS.

For a rivalry already steeped in animosity, the streak only heightens the stakes for the stretch run.

With the win, the Mets improved to 71-61 while the Phillies fell to 76-56. Seven head-to-head matchups remain, offering the Mets a chance to close the gap entirely.

“We’ve been swinging the bat the whole month,” Mendoza said. “We just need to keep this going. The playoffs are within reach if we do.”

As fans filed out into the Queens night, the mood was unmistakably hopeful. The season that once felt like a disappointment has new life, and the man at the center of it — Brandon Nimmo, grinning and soaked in Gatorade — summed it up best.

“No matter the deficit, we know we’re just a rally away.”