MILWAUKEE — Mets first baseman Pete Alonso camped out under a tall pop-up in the seventh inning at American Family Field on Thursday. The ball reached up to make the catch and bounced off his glove into the net in foul territory.

Earlier in the inning, the Brewers had taken a 2-0 lead on consecutive home runs, causing chaos in the domed stadium. When Alonso dropped the pop-up, Milwaukee seemed destined to win. The crowd felt it and in turn it got louder.

But Alonso did not let it influence him.

“Next play, next pitch. Whether it is defense or attack, focus on the next one,” Alonso said his attention turned after the failed play. “You can’t stay stuck in the past.”

BUY METS TICKETS: STUBHUB, VIVID SEATS, TICKET MASTER

At that point, Alonso was struggling at the plate, going 1-for-8 in the series. He hadn’t homered in 49 at-bats dating back to the regular season, and felt the pressure as the Mets trafficked the bases, but couldn’t hit the big home run to drive in those runners.

Alonso, the team’s leading power hitter who leads the NL with 226 home runs since breaking through as a rookie in 2019, felt the pressure. If he can’t hit one over the wall, no one will.

In the ninth inning, with the Mets trailing 2-0, the Brewers called on their closer Devin Williams to close the doors. First, he issued a leadoff walk to Francisco Lindor, who had the Mets’ hits in the game at the time.

‘The only thing I kept saying to myself was: ‘You have to win this at bat. No matter what happens, just win this at-bat and let the guys behind you do the work,’” Lindor said of his at-bat after the game.

After Lindor’s walk, Williams gave up an one-out single to Brandon Nimmo, putting runners on the corners.

That’s when Alonso stepped up to the plate and got the chance to redeem himself. After working the count to 3-1, he swung into the middle of the plate on a changeup.

“As soon as I hit it I was like, ‘Hell yeah! Nobody understands that,” said a delighted Alonso after the match. “I’m just so happy right now.”

Those watching weren’t sure if the ball went out of bounds. Even Lindor had his doubts.

“I went back to tag,” Lindor noted.

The ball came off Alonso’s bat more like a line drive than a moonshot, and he kept carrying until it finally cleared the right-center wall 60-100 yards, giving the Mets a 3-2 lead . According to Statcast, this is a home run in only 13 of the 30 Major League stadiums.

As Alonso walked around the bases, he pumped his fist in delight. He had waited so long to deliver this hit, and on the biggest stage he came through.

“When it comes to winning baseball, you just have to do your part every day,” Alonso said. “You’ve got to stay focused, you’ve got to stay locked in and I just kept getting professional at-bats. I’m just very happy that I was able to contribute.”

The Mets scored another run on Alonso’s home run and won 4-2. They face the Phillies in the NLDS on Saturday.