Manager Buck Showalter admitted that the Mets didn’t pitch well and let a game “get away from us” on Saturday afternoon, two statements that really didn’t need to be said after his team suffered the most lopsided home loss in team history.

The Mets received a far better pitching performance from Jose Quintana in the nightcap of a day-night doubleheader against the Braves following an embarrassing 21-3 blowout loss in the matinee portion.

But their bats remained silent, and they were swept in the twin bill with a 6-0 loss in Game 2 at Citi Field.

MLB strikeout leader Spencer Strider outdueled Quintana, who allowed one run over six innings in his best of five steady starts for the Mets since he came off the injured list on July 20.

Errors by second baseman Danny Mendick and center fielder Tim Locastro on the same play led to an Atlanta run in the eighth inning of Game 2.

Strider struck out six over seven scoreless innings to extend the dominance of the Braves’ starting pitchers in this series, which began with a 7-0 shutout on Friday night and included seven scoreless frames by former Mets farmhand Allan Winans in the first game Saturday.

In Game 1, the Mets (52-65) fielded a makeshift lineup that barely would have met requirements for a road game in spring training, much less an August clash against the team with the best record in baseball.

Winans, the Mets’ 2018 17th-round draft pick, was left unprotected and was then selected by the Braves in the 2021 Rule 5 draft.

He throttled an already trade-depleted lineup that was without injured starters Francisco Lindor and Brandon Nimmo, though both returned to action for Game 2.

In his second big league start, Winans allowed no runs on four hits over seven innings, but the Mets avoided a second consecutive shutout on Daniel Vogelbach’s three-run homer in the eighth inning.

“Just not doing much offensively … it’s been a real challenge for us,” said Showalter, whose plummeting club has lost 10 of 12 since dealing away key players at the Aug. 1 trade deadline. “We get some people out there [on the bases], we just can’t make it work for us.”

The MLB-leading Braves (75-41) scored five runs on eight hits against fill-in Game 1 starter Denyi Reyes during his 4 ²/₃ innings of work.

Relievers Reed Garrett and Josh Walker, along with Mendick, were rocked for 16 additional runs — eight in the ninth innings versus Mendick — and six home runs over the final four innings, including two by MLB leader Matt Olson.

Reyes’ lone previous start for the Mets, on May 1 against the Braves, didn’t go well, either. The righty was knocked out of that game before he recorded an out in the second inning, and he allowed five earned runs and two home runs in a 9-8 Mets loss.

On Saturday, the Mets didn’t register a hit against Winans until Vogelbach’s single to left with one out in the fourth. By then, they trailed 5-0 after a two-run single in the top half pf the fourth by Ozzie Albies.

Olson clubbed his MLB-leading 41st and 42nd homers of the season in the sixth and eighth innings, respectively. Albies also homered in the seventh to push the Mets’ deficit into double digits.

Sean Murphy homered in the eighth, prompting Showalter to bring in Mendick, who yielded two more home runs, to Riley and Lopez, in the ninth.

“That’s what you run into. Mendick’s done that job before, but you can’t ask people to make outs,” Showalter said. “It counts, so I understand.

“This is what guys do for a living; they hit for a living. And we inflicted that on ourselves … it’s not their fault that we didn’t play very well, or pitch very well.”

Quintana’s work certainly marked an improvement in Game 2. The lefty allowed only one run, on an RBI single to former Met Kevin Pillar, in the fifth of his six innings.

Mendick booted a smash by Riley in the eighth inning, and Locastro overran the ball in center field, enabling Albies to score for a two-run lead. Ozuna ripped an RBI double against Drew Smith later in the inning for a 4-0 Braves advantage before Albies added a two-run homer in the ninth.