This Mets homestand hardly went according to plan, from washouts to more losses than wins.

They ended things on a high note, at least, with a 5-3 win over Atlanta in the second game of Monday’s doubleheader at Citi Field following the 9-8 loss in the opener.

Francisco Alvarez delivered the key blow in the win, a go-ahead, two-run double with two outs in the bottom of the sixth and David Robertson closed it with his first two-inning save of the year. 

It gave the Mets a split of the twinbill after they’d lost six of seven and Atlanta had won five of their last six.

And it also snapped the Mets’ six-game losing streak to their NL East rivals.

They’ll head to Detroit for three games, where Max Scherzer and Justin Verlander are expected to start two of the games, as they look to put a shaky first month of the season behind them.

The day got off to a rough start for the Mets, who fell behind early and couldn’t catch up, as the Braves used a pair of three-run homers from Sean Murphy to take the opener.

Eduardo Escobar’s pinch-hit solo homer off lefty A.J. Minter with two outs in the bottom of the ninth got the Mets to within a run and Brett Baty followed with a shot to right, but it was right at Ronald Acuna Jr. to end the game.

Atlanta continued to pour it on in the second with a two-run homer from Kevin Pillar that ended Denyi Reyes’ day. 

John Curtiss came in and was greeted by a mammoth homer into the upper deck in left by Acuna Jr. that was measured at 448 feet to make it 6-1.

But the Mets got back into the game in the bottom of the third, as Starling Marte led off with a single and Lindor walked before Alonso hit his 11th homer of the season, a three-run shot that cut the deficit to 6-4. 

Spencer Strider retired the final nine batters he faced in his 107-pitch outing.  

A laser home run over the Mets bullpen in right-center by Baty to lead off the bottom of the sixth against Dylan Lee made it a one-run game. 

It was Baty’s first career homer off a left-hander and came against Lee, who is typically excellent against lefty hitters.

Murphy hit his second three-run homer of the afternoon in the seventh for a 9-5 Atlanta lead.

The Mets weren’t done, as they loaded the bases with no one out in the seventh and scored two runs on Vogelbach’s grounder to first, when shortstop Vaughn Grissom threw the ball away trying to complete a double play. 

But the rally ended there.

The second game began with Tylor Megill drilling Acuna Jr. in his upper back, near his left shoulder. It forced Acuna Jr. from the game.

Vogelbach got the Mets’ offense started with an RBI double in the second that scored Jeff McNeil and Marte had a run-scoring single to score Baty in the fifth.

But Megill, who was excellent through five innings, faltered in the sixth, giving up a leadoff double to Chadwick Tromp and a pair of walks to load the bases with two outs.

Megill remained in the game to face the lefty-swinging Eddie Rosario, even with Drew Smith up in the bullpen.

Rosario’s three-run double gave Atlanta the lead, but Alvarez answered with his two-run double in the bottom of the inning.