A nearly flawless April for the Mets added a perfect component Wednesday. 

Seven games on the homestand, seven victories. 

“It was marvelous,” Starling Marte said through an interpreter after his walk-off RBI single in the 10th inning sent the Mets to a 4-3 victory and three-game sweep of the Phillies at Citi Field. 

The homestand sweep was only the second of at least seven games in franchise history. Overall, the Mets are 12-1 at Citi Field this season. 

Marte’s broken-bat single to center against Jordan Romano brought in Pete Alonso, who had tied the game earlier in the inning with an RBI double.

It was an especially sweet moment for Marte, who has been relegated to part-time duty for the first time in his career and admitted to The Post last week that the transition hasn’t been easy. 

“With the circumstances that I am currently in, to go out there and put the ball in play … to come through for the team it feels really good to see the team smile and come together in a win like that,” Marte said. 

The Mets (18-7) have found different heroes.

The constant lately has been Francisco Lindor — who reached base three times on this day and hit four homers on the homestand.

But there was no shortage of big performances for the Mets. 

Max Kranick became part of the story by entering in the 10th inning after Edwin Díaz departed with a left hip cramp and getting the final two outs to keep inherited runner Nick Castellanos stranded at third and the bases loaded.

It kept the Mets’ deficit at 3-2 after Castellanos’ single against Díaz had scored the automatic runner. 

“Getting hot today took a little bit, but I am happy I was able to come through for the team,” Kranick said. 

Juan Soto’s arm prevented the Phillies from scoring the go-ahead run in the eighth.

Soto nailed Castellanos trying to score from second on Max Kepler’s two-out single to right against José Buttó. Hayden Senger lunged across the plate after receiving the throw to tag out the sliding Castellanos. 

“Today was an example of a lot of winning plays, a lot of fundamental plays,” manager Carlos Mendoza said. “There’s a lot of good things happening.” 

It was the first real measuring stick series of the season for the Mets, who arrived at Thursday’s off-day — their first break after 13 straight games — with every reason to feel as if this is their year. 

“There’s a lot of good things we can point to,” David Peterson said. “Everybody has got their things, whether you are going well or not, that you are working on. But when the lights go on, we’re 26 guys as one against the other team, and it’s just fun to play with these guys.” 

Peterson was tagged for 15 hard-hit balls as measured by Statcast, but kept the Mets in the game by allowing two earned runs over 5 ¹/₃ innings. Peterson surrendered eight hits (all were singles) and he walked one with two strikeouts. 

It was a second straight start in which the lefty, who threw 89 pitches, failed to complete six innings.

But Peterson has kept opponents to two earned runs or fewer in four of his five starts this season. 

Brett Baty’s two-run homer against Zack Wheeler in the second gave the Mets a 2-0 lead.

The blast was Baty’s first this season — just as the team prepares for Jeff McNeil’s potential return from the injured list on Friday.

Mark Vientos opened the inning with a single before Baty, with two outs, launched a shot into the right field porch. 

After escaping a bases-loaded jam in the second, Peterson dented in the fourth, when the Phillies scored twice to tie it. Johan Rojas delivered a third single in the frame to bring in the first run.

Trea Turner’s ensuing RBI single through the first base hole tied it 2-2.

Alec Bohm and Weston Wilson also had singles as part of the rally. 

The Mets threatened to win in the ninth with two-out singles from Luisangel Acuña and Luis Torrens against José Alvarado before seizing the victory in the 10th. 

“We’re all playing for each other,” Alonso said. “This is a really great group.”