LOS ANGELES — Mark Vientos certainly hasn’t let the magnitude of October baseball overwhelm him. 

If anything, the Mets third baseman — in his first postseason — has embraced the pressure, helping carry a good but not great lineup that can use every big hit possible. 

On Monday, with the Mets in need of a victory ahead of their 2,500-mile voyage home, Vientos delivered early against the Dodgers, giving his team breathing room later.

The Mets got the cushion they wanted with Vientos’ second-inning grand slam and held on for a 7-3 victory in Game 2 of the NLCS at Dodger Stadium. 

Capitalizing on a Dodgers bullpen game, the Mets inflicted most of their damage in the first two innings and let Sean Manaea and three relievers handle the rest.

The Mets left town with the series tied 1-1 and can look toward three straight sellouts at Citi Field beginning Wednesday with Game 3. 

Vientos showed his mettle through the regular season and again in the first two rounds of the playoffs, producing a 1.037 OPS in his first eight games.

That included a game-tying homer in the ninth inning of Game 2 in the NLDS in Philadelphia.

This time he fed off the fact Francisco Lindor (who led off the game with a homer) was intentionally walked ahead of him to load the bases. 

“I took it personal,” said Vientos, who cleared the fence in right-center on the ninth pitch of his at-bat against Landon Knack. “I want to be up there during that at-bat for sure. I want them to walk Lindor in that situation, put me up there. And at that point I was just, ‘Let me simplify the game, get one run in. Get a walk.’ Luckily I hit a bomb there and it went over the fence.” 

The Mets welcomed Vientos’ early haymaker a day after the team managed only three hits in a 9-0 loss.

The Game 1 setback marked the first time this postseason the Mets fell behind in a series. 

“It was an important game today, especially after the way we played [Sunday] night,” manager Carlos Mendoza said. “It was a quick turnaround, but we’ve done that the whole year. We got punched in the face and we continue to find ways to get back up. And it will continue to be that way.” 

Lindor punctuated an eight-pitch at-bat against Ryan Brasier with a homer to right field leading off the game.

It was the second homer in three games for Lindor, whose grand slam last Wednesday carried the Mets to victory in Game 4 of the NLDS. Lindor’s homer on this day ended the Dodgers’ scoreless streak at 33 innings.

The streak tied the postseason record established by the 1966 Orioles (all of which occurred in the World Series against the Dodgers). 

The Mets jumped all over Knack in the second.

Starling Marte singled leading off the inning and Jesse Winker walked. Tyrone Taylor’s RBI double with one out extended the Mets’ lead to 2-0.

After Francisco Alvarez was retired, Lindor received an intentional walk and Vientos blasted a 95-mph fastball for the grand slam. 

“I didn’t think he was going to give me a fastball,” Vientos said. “That was my approach — to see a heater up, but I wasn’t expecting a heater. I thought I was going to get a slider and poke it in the hole or something.” 

Manaea didn’t dent until the fifth, when Max Muncy cleared the right-field fence to pull the Dodgers within 6-1.

It was only the second hit allowed by Manaea, who also dominated the Phillies in his start in Game 3 of the NLDS last week. 

It got interesting in the sixth. Manaea walked Mookie Betts and Teoscar Hernandez in succession before Jose Iglesias booted Freddie Freeman’s grounder to load the bases.

Phil Maton entered and allowed a ground ball single under diving Pete Alonso’s glove that brought in two runs.

Maton escaped by getting Kiké Hernandez to hit into a double play with the bases loaded. 

Ryne Stanek replaced Maton in the seventh after he had walked Ohtani. Stanek struck out Betts before retiring Teoscar Hernandez to keep the Mets’ 6-3 lead intact.

After Stanek allowed a single and walk in the eighth, Edwin Diaz was summoned and recorded the third out. 

Marte grounded an RBI single in the ninth after Alonso had walked and stolen second, extending the Mets’ lead to 7-3. 

Diaz allowed a single and walk in the ninth before striking out Betts, Teoscar Hernandez and Freeman to end it. 

“In the ninth I tried to throw strikes, attack the hitters, because we were winning by four runs,” Diaz said. “I got a good lead to challenge. That is what I did. I gave up a blooper and then I walked Ohtani. And then I trusted my fastball and threw it right in the middle for them.”