Marcus Stroman took an unorthodox route to the mound Tuesday night, but it didn’t get in the way of his dominant start to the season.

After the Mets burned him Sunday, when he threw nine pitches in a game that was suspended three batters in, Stroman came back to start Tuesday night on short rest and tossed six shutout innings in a 4-0 win to complete a doubleheader sweep against the Phillies at Citi Field.

“Coming out here today was kind of a question mark, to be honest,” Stroman said. “The staff in here, our training staff was awesome with getting me the work I needed to get in order to get my body in shape and ready to go. We did that and I felt great.”

Stroman would have gotten a shot at the seven-inning complete game, but he batted for himself in the bottom of the sixth, walked and spent an extended time on the bases. Manager Luis Rojas said Stroman’s legs were shaking because of how cold he was and the pitcher made the “heads-up” decision to alert the dugout to get somebody up in the bullpen. Stroman said he didn’t think it was a smart idea to push it, especially given his irregular schedule leading into Tuesday.

Jeurys Familia handled the seventh inning. Stroman ended his night having given up only four singles and no walks while striking out three during an 86-pitch outing.

The scoreless effort built on Stroman’s season debut, which also came against the Phillies last week, when he gave up just one run across six innings in a win in Philadelphia.

Stroman retired the first nine batters he faced in order before giving up a single to begin the fourth. But he used double-play balls to get out of that inning and the sixth unscathed — courtesy of some fine defense from shortstop Francisco Lindor.

“This guy works so hard,” Rojas said. “He’s in unbelievable shape. That’s why he was able to bounce back after Sunday.”

After Sunday’s abbreviated start, Stroman had initially planned to go through his normal five-day routine and not pitch again until Friday. But he played catch on Monday and felt good enough to tell Rojas he could take the ball for Tuesday’s nightcap.

“It’s a lot when you get mentally and physically prepared for a start,” said Stroman, who credited his trainer, Nikki Huffman, for getting him ready. “As starters, we’re so in routine. To throw that off, it can kind of throw your whole body off. … I did a bunch of soft-tissue [work] this morning to put my body in position to be able to dominate. I’m just happy it worked out that way.”