BALTIMORE — Oswaldo Cabrera and Franchy Cordero kept the Yankees afloat for a while Friday, but enough cracks from Clarke Schmidt and the bullpen sunk them anyway.

The Yankees watched as the Orioles set off fireworks at Camden Yards ahead of their home opener Friday afternoon, before Baltimore kept the blasts coming to win 7-6 in a back-and-forth affair in front of a sellout crowd of 45,017.

Schmidt was knocked around for a second time this season, and the Yankees’ bullpen unraveled in the game-deciding seventh inning as they lost the series opener.

In that seventh inning, the score was tied 5-5 when Ron Marinaccio walked Ryan Mountcastle, then was pulled for Jimmy Cordero, who was a mess immediately.

Cordero’s first pitch went to the backstop, and his second, to Ramon Urias, was crushed off the wall in left-center field for a go-ahead RBI double.

After Urias advanced to third on a ground out, Cordero’s sixth pitch of the game was a second wild pitch.

That brought Urias home, giving the Orioles a 7-5 lead they held — barely.

The Yankees got a run back in the eighth, when Cabrera (3-for-4 with a double and three RBIs) drilled an RBI single into right field.

With runners on first and second and none out, Jose Trevino hit a bullet that bounced right to Urias, the third baseman, who stepped on the bag and threw to first for a double play.

After Cabrera stole third, manager Aaron Boone left righty-hitting Isiah Kiner-Falefa in to face Baltimore righty Bryan Baker, eschewing the switch-hitting Aaron Hicks.

Kiner-Falefa struck out to end the inning.

The Yankees got Aaron Judge to third base in the ninth inning, but Baltimore closer Felix Bautista got Anthony Rizzo to fly out to finish the game and set off more Camden Yards fireworks.

All six of the Yankees runs were driven in by corner outfielders Cabrera and Franchy Cordero, who drilled his first Yankees home run — a three-run shot in the fourth — to get his team back in the game.

The first righty bat off the Yankees’ bench was Kiner-Falefa, who popped up with a runner on third as a pinch-hitter for Cordero in the sixth inning, then remained in as the center fielder.

Hicks, who appears to be the fifth outfielder at the moment, again did not play.

He has started two of seven games this season.

The Yankees had climbed out of the early hole and grabbed a 5-4 lead in the seventh, when Cabrera crushed a two-run double, but the lead did not last long.

The Yankees had to lean on their bats because their starter was shaky.

Schmidt was hit hard — 11 batted balls were struck at least 95 mph — and chased after 3 ¹/₃ innings, in which he allowed four runs on five hits and three walks, as a career-long problem continued to haunt him.

Schmidt added a cutter this offseason in hopes of neutralizing opposing lefty batters, who always have swung well (.797 OPS last season) against the righty.

The early returns have been poor: After Orioles lefty-swingers went 4-for-9 with two walks, lefty hitters are a combined 8-for-19 with three walks and two home runs against him this season.

The 27-year-old allowed two runs apiece in the second and third innings, burying the Yankees in a 4-0 hole.

The Orioles grabbed their first lead in the second inning, when lefty Gunnar Henderson singled and was later driven in by lefty Adam Frazier’s single.

With two on and one out, Austin Hays hit what might have been an inning-ending double play, but Gleyber Torres booted the ball, which allowed Ramon Urias to score.

An inning later, lefty-swinging Adley Rutschman walked before Anthony Santander doubled.

After a sacrifice fly, Henderson’s RBI double gave the Orioles a fourth run.

The Yankees started poorly and, as it turned out, finished poorly.