PHILADELPHIA — The rain washed away the slop, and a game to forget became a game to remember.

The Mets entered a 46-minute rain delay in the bottom of the sixth inning in a three-run hole and stormed back with clearer skies — and Mark Canha thunder — to steal a 10-9 victory and a series at Citizens Bank Park on Sunday.

Canha homered twice, once in the seventh and again in the ninth, to lift the Mets to a win in which they seemed buried three times. The Mets came back from a 4-0 hole, a 7-4 deficit and an 8-7, ninth-inning ditch that Canha’s bat took care of.

“The offense, they just didn’t give in,” manager Buck Showalter said of the Mets (79-44), who moved four games up on the Braves. “A lot of people after the rain delay and the way the game was looking would have come back out and not had that intensity. Our guys thought there was a game there to be won.”

Canha stroked a go-ahead, two-run home run to left field against former Yankee David Robertson and added some theatrics to the moment. He flipped his bat high in the air before starting his jog, in which he lifted his arms in triumph from first base to second base.

Since the Mets traded for Tyler Naquin, Canha has fallen into a platoon in left field during a season in which his power has taken a dip. He called his second homer of the afternoon “emotional” — partly, too, because Philadelphia’s Jean Segura had pumped his fist while rounding the bases with his eighth-inning, go-ahead homer — and said this was his favorite bat flip in eight years as a major leaguer.

“The lack of power has been kind of frustrating, but I realize it’s a journey,” said Canha, who set a new career high with five RBIs. “So it’s kind of been a long haul for me to get to this point where I am in the season. I was just super happy to contribute and get one for the boys.”

Brandon Nimmo’s ensuing home run provided some insurance that proved important. Edwin Diaz looked shaky in a surprising ninth in which he allowed a run on two hits and a walk, recording two outs on fly balls to the warning track.

But with runners on first and second, Diaz struck out Darick Hall to secure his 28th save.

The Mets, who were coming off their first series loss against an NL East opponent, in Atlanta, responded by taking three of four from the Phillies. The Mets have been dealing with a depleted staff that prompted two club debuts Saturday and two major league debuts Sunday, but they kept winning anyway.

Three of the four games against Philadelphia were started by Jose Butto (who debuted Sunday), David Peterson and Trevor Williams.

“I had four pitchers today, and we used them all,” Showalter said of Butto, Nate Fisher (who also debuted), Trevor May and Diaz.

Canha’s blasts made the work of Fisher even more important. The lefty, who worked in a bank last year, threw three scoreless innings that bridged the delay.

The Phillies crept back ahead in the eighth inning against May, when Segura’s home run untied the contest.

Canha had blasted a three-run home run in the seventh to tie the game. As he watched Segura and the Phillies grab the lead, he told himself, “You’re going to do it again, you’re going to win it.”

He won it with some help from a 26-year-old whom he did not know existed before he trotted out of the bullpen. Fisher weathered the fifth, sixth and seventh innings and was the most important pitcher on the day.

In terms of debuts, Fisher’s beat Butto’s, whom the Mets were forced to summon for a spot start that went south quickly. The organization’s No. 15 prospect was tagged for four runs in his first major league inning, the biggest blow a three-run shot from Alec Bohm. He settled down until the fourth, when Bohm took him deep again, closing Butto’s debut with seven runs allowed in four innings.

“I thought Butto did not implode and break after the first inning,” Showalter said.

The Mets escaped from the 4-0 hole by chipping away, with RBI hits from Michael Perez, Daniel Vogelbach and Starling Marte.

They escaped from the ensuing holes with louder contact. They were frequently down but never buried.

“We expect to win until the game’s over,” Canha said.