DETROIT — The last — and only — time the Yankees have lost a game Luis Severino has started this season was nearly two months ago.

Since then, the Yankees have won 10 in a row with the right-hander on the mound and he was overpowering again in the first game of Monday’s split doubleheader, a 7-4 win over the Tigers, their fifth straight victory heading into the nightcap at Comerica Park.

“He is our ace and there is an expectancy that comes with that,’’ Austin Romine said after Severino held Detroit to two runs — one earned — in eight innings. He struck out 10 and walked none.

Romine added a three-run homer in a six-run fourth that allowed Severino to cruise the rest of his outing.

Severino also improved to 9-1, matching Washington’s Max Scherzer for the most wins in the majors.

And while “wins” for starters doesn’t mean nearly what they used to — even to Severino — his pitching coach didn’t dismiss their importance.

“I kind of like wins,’’ Larry Rothschild said. “I know it’s not the soup of the day, but I like them. … When you’re a starting pitcher, you need to start games to win games. I think it gives you a little more drive. If you don’t have that purpose in the back of your mind to win the game, I think there’s a little different approach. Winning games is part of that edge.”

So is the three-pitch arsenal which Severino possesses.

“Some of the stuff he went through in his career early, I think that molded him to where he is now,’’ Romine said of Severino’s struggles in 2016. “He’s aggressive and he’s a beast on the mound. It’s innate. It’s in his makeup. He’s a bulldog. He’s confident in his stuff right now, even on days where maybe it’s not all there.”

The game didn’t go entirely according to plan, as Jonathan Holder gave up a pair of unearned runs in the ninth, forcing Aaron Boone to go to Aroldis Chapman to get the final out in a game the Yankees led by five runs heading into the final inning.

Severino got off to a bumpy start against the Tigers, who had a four-game winning streak snapped Sunday.

In the bottom of the first, Miguel Cabrera followed a Nicholas Castellanos one-out single with a hard grounder that got by Miguel Andujar at third for an RBI double.

The Yankees answered in the third against Drew VerHagen, who was making his first start with the Tigers this season after nine appearances out of the bullpen and six starts with Triple-A Toledo.

Gleyber Torres tied the game at 1-1 with an opposite-field homer on a 3-1 pitch. It was the rookie’s 10th homer of the season.

Greg Bird put the Yankees up 2-1 with a leadoff homer in the fourth, his second since returning from ankle surgery. The blast was the first of six consecutive hits off VerHagen to open the fourth.

Giancarlo Stanton and Didi Gregorius followed with singles before Miguel Andujar’s liner to center scored Stanton. Clint Frazier’s hit through the left side of the infield made it 4-1 and then Romine, who had just missed a homer in the third, hit one out to left-center for a 7-1 lead.

It was the Yankees’ last hit of the afternoon, but it didn’t matter, as Severino found his rhythm and retired 10 in a row after Cabrera’s double.

A two-base error by Torres led to an unearned run in the fifth.