“Doubt?” Marcus Stroman said, repeating a questioner’s word back to him. “No. No doubt, my man . . . I don’t do doubt. I knew I’d be back at some point. It was just a matter of when.”

“When” turned out to be Sunday at Yankees Stadium, when Stroman made his first start since April 11 in what would become a 12-5 Yankees victory over the Athletics.

It was worth the wait.

He went five innings and got his first victory of the season, allowing one run — on a solo home run by Willie MacIver in the fifth — on three hits and two walks. He struck out one.

By the time he officially was out of the game after 74 pitches, the Yankees had a 10-1 lead.

“I thought he was terrific,” manager Aaron Boone said, then praised Stroman for his mound presence, his unpredictability and his versatility.

“He gave us everything we needed. Really happy for him. I know it's been a couple months and him wanting to really get back and contribute. That was an important outing for him, and that was an important outing for us.”

The former Patchogue-Medford High School star went on the injured list April 12 because of left knee inflammation.

That was a day after his third start of the season, at which point he had an 0-1 record and an untidy ERA of 11.57. He did not complete five innings in any of his first three starts.

That all changed on Sunday. If Stroman, 34, can build on his reintroduction it will benefit the Yankees as they move into the midseason’s dog days and beyond.

No. 5 starter Ryan Yarbrough is on the injured list with an oblique injury, opening an opportunity for Stroman to make an impression.

He had made three rehab starts for Double-A Somerset, most recently on Tuesday, when he allowed five runs and 10 hits in 3 2/3 innings.

But he said that game mostly was to ensure his body was ready to go, and he never wavered in that belief as Sunday approached. Then he took advantage of the chance.

“It was great to see how he turned the page and came back with a vengeance in him,” Jazz Chisholm Jr. said. “He just attacked the zone all day and made great pitches.”

Stroman said his goal simply was to go deep into the game by pitching efficiently. He said he had no concern about his knee.

His final confirmation that it would be a good day came during a positive pregame bullpen warmup.

“I just feel like I’ve done a really good job putting my body and my mechanics in a better position,” he said, thanking the team’s coaches and trainers for their help. “It’s been a process, but I feel good. I feel like this was a good building block to the next start.”

Stroman left the game to a parade of hugs and handshakes on the bench.

“It’s not the same being on the side,” he said later. “You feel like you’re left out. Definitely good to be back with the boys.”

The worst of Stroman’s day came in the second inning, when Max Muncy hit a sharp comebacker that bounced off his right hamstring for an infield single.

“It crushed me,” Stroman said. “Pretty firm. It hurt a lot.”

But he had no intention of leaving the game after waiting all this time to get back in one.

“No, no, no, no,” he said. “Adrenaline is a great drug. I won’t feel it until tonight.”

That question about doubt centered on whether he was concerned when the knee problem lingered into early summer. But he said that when he tore his ACL in the same knee in 2015, he was back in five months, so he would not allow this problem to erase his season.

Starting pitching has been a Yankees strength, including a major-league-best 2.96 ERA over the past 60 games. But having Stroman in the mix adds to the rotation’s depth.

He is in the final year of a two-year, $37 million contract, so he also must prove to the rest of baseball he still has some good years left in him.

On Sunday, there seemed to be no doubt about that.