Just over an hour before Sunday’s first pitch, Journey’s “Don’t Stop Believing” blared through the Mets clubhouse.

Either it was meant as inspiration for a downtrodden club or a reminder of the last scene from “The Soprano’s” when the song is heard before a fade to black.

The Mets avoided a further fade toward black on this day with a ninth-inning rally the bullpen didn’t have to protect.

Omar Narvaez delivered a walk-off RBI single that capped a three-run inning in the Mets’ 4-3 victory over the Giants before a sellout crowd of 41,016 at Citi Field.

All still isn’t great for the Mets, who are 7-16 in May (with the NL West-leading Dodgers on deck), but at least a losing streak that had reached five games was declared over.

The Mets were on the brink of falling 10 games below .500 before their rally against Tyler Rogers.

“There are countless games the past 10-15 days where when I think about all of them, one pitch either direction decides it,” said Harrison Bader, whose two-run double in the ninth tied it. “When you are doing that on all sides of the ball over nine innings, if it comes down to one pitch that doesn’t go your way, you can’t lose your mind over it. We’re swinging the bat well. We’re taking care of the baseball. We’re doing more than enough things to put ourselves in a position to win.”

Brandon Nimmo and J.D. Martinez singled in succession in the ninth to begin the winning rally.

After Jeff McNeil was hit by a pitch with one out to load the bases, Bader’s double brought in two runs to tie it and Narvaez’s single won it.

Brett Baty was intentionally walked ahead of Narvaez, who was 0-for-27 at home this season.

Narvaez’s single cued the Mets to empty from the dugout for the celebration of a fifth walk-off victory this season.

“We needed that, especially with the way things have been going around here as of late,” manager Carlos Mendoza said. “And credit to the fan base, too, because we felt the energy. They stayed there until the ninth inning, it was a packed house and the guys feed off that. A credit to them because it hasn’t been pretty, but just know that we’re going to continue to compete, so a shout-out to the fans.”

After two straight bullpen meltdowns, the Mets received a solid relief outing from Adrian Houser, who allowed one earned run over four innings.

For the 16th time in 52 games this season a Mets starting pitcher didn’t last beyond the fifth inning: Sean Manaea allowed two earned runs on five hits and one walk over five innings with six strikeouts.

“About as average as it gets,” Manaea said.

Tomas Nido’s throwing error on a pickoff attempt in the second gave the Giants a 1-0 lead.

Matt Chapman, who doubled leading off the inning, was on third and took steps toward the plate on a pitch in the dirt.

Nido overshot Baty on a throw to third to bring in Chapman.

The Mets used Logan Webb’s error to tie it 1-1 in the bottom of the inning.

Wilmer Flores fielded DJ Stewart’s grounder and flipped just behind Webb covering first base.

Webb mishandled the throw and Stewart raced to second on the play.

Bader delivered a two-out RBI single to tie it.

Bader’s single snapped an 0-for-14 skid for the Mets with runners in scoring position over two games.

Brett Wisely homered leading off the third to put the Mets in a 2-1 hole.

The blast was only the third allowed by Manaea this season.

Bader extended over the center-field fence to rob Chapman of a homer leading off the sixth against Houser.

But the Giants still added to their lead in the inning as Flores doubled and, following Jorge Soler’s single, scored on Hellot Ramos’ fielder’s choice, extending the Giants’ lead to 3-1.

Baty had two strong defensive plays late, ranging into the hole and spinning to throw out Chapman in the eighth before leaning over the tarp to snag Mike Yastrzemski’s pop-up for the final out in the ninth.

“We were down a little bit lately because we’re not getting results in the win column,” Bader said. “But I think we’re playing good baseball. I think we’re doing a lot of good things to put us in position to win, so to come out with a win, having the same approach is good for us moving forward.”