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The fans who booed all series long ended up laughing (and cheering) last.

Round 1 of maybe 30 Juan Soto Bowls over the next 15 years went to the home team largely because of three surprises: the most impressive at-bat of Jorbit Vivas’ career, Pete Alonso taking his slump to the field and a stunning, six-run bottom of the eighth.

The Yankees broke through in the frame to grab the most thrilling and tense 8-2 victory you will see, beating the Mets in The Bronx in front of a season-high 48,028 — who might have created the loudest game of the team’s season.

Soto finishing his return to his former home by going 0-for-4 with two strikeouts and an eighth-inning rally to remember demanded plenty of noise in what was a well-played and competitive series that felt mistimed. Such dramas rarely play out this early.

“I thought all three games were really good,” Yankees manager Aaron Boone said. “Clearly two really good teams having a little fun in May.”

The Yankees had more fun because of their eighth inning against fireballer Ryne Stanek. They put runners on second and third for Vivas, a 24-year-old rookie playing in his 15th career game. He then conducted an at-bat in which he looked like a 15-year vet.

“He’s throwing 100 miles per hour,” Vivas said through interpreter Marlon Abreu. “I didn’t want to do too much.”

He did enough. He went down 0-2, fouled off a couple of fastballs and then ignored three pitches out of the zone. He fouled off three more four-seamers. Finally — on pitch 11 — he sent a ground ball Alonso’s way.

The Mets first baseman, whose brilliant April has given way to a rough May, fielded and threw the ball to the backstop, Jasson Domínguez diving home for the go-ahead run.

“That’s a play I usually make and make it pretty routinely,’’ Alonso said. “I had my feet set and just didn’t get my fingers on top of the baseball and it sailed. It’s 100 percent on me.”

The dam broken, the runs began racing in.

Paul Goldschmidt followed with an RBI single. After a Trent Grisham walk, Cody Bellinger blasted a grand slam just out of the reach of Soto’s glove, electrifying the home crowd and home dugout.

On one night at least, the Yankees offseason Plan B — strong work from Max Fried, a nice day from Goldschmidt, a six-RBI night from Bellinger and a scoreless eighth inning from winning pitcher Devin Williams — beat both their own Plan A and the Mets.

The Yankees (27-19) have won eight of 11, and the Mets (29-18) halted a three-series winning streak to conclude a three-game set that lived up to the hype. The Bronx fans alternated pitchforks with pompoms to create an atmosphere that felt like October.

“It’s always fun playing the Subway Series,” said Aaron Judge, who reached base three times, including a ground-rule double that led to the first Yankees runs, and made a diving grab to retire Francisco Lindor. “It doesn’t matter what year it is, it’s always going to be exciting.”

It was particularly exciting given the right fielder on the other team. Judge and Soto hugged on the field before the game, the first time they had been able to see each other this series, and Judge said he wished him well.

The Yankees pitchers did not do so, Soto held off base and well-pitched especially by Max Fried, whose curveball buckled Soto’s knees and sent him back to the dugout in the third inning.

A couple of the better lefties in baseball dueled deep into the game, Fried and David Peterson with identical lines (six innings, two runs allowed).

The Yankees gave Fried a 2-0 lead in the first, and the Mets inched their way into a tie by the fifth inning.

In the second, a swinging bunt from Mark Vientos, a walk to Brandon Nimmo and a single from Jeff McNeil scored a run.

Three innings later, Fried bounced a curveball, which turned into a wild pitch that scored McNeil from third.

The Yankees had only gotten to Peterson in the first, the blow a double from Bellinger that caromed off Alonso’s glove and into foul territory to drive in two.

That would not be the last defensive play Alonso would have liked back.

“We didn’t get the job done and we lost the series,” said Mets manager Carlos Mendoza, who now heads to Boston. “Now we’ll get ready for another good team.”