BALTIMORE — After another disappointing loss to the lowly Orioles, Aaron Boone had a simple explanation for the Yankees latest defeat.

“They executed in the 10th,’’ Boone said. “They got a bunt down and a ball in the air.”

And because of that — at least in part — the Yankees dropped another game at Camden Yards, 4-3 in 10 innings to walk away with a series split and fall back into a last-place tie with Baltimore to close out an eight-game road trip.

The Orioles did what the Yankees couldn’t in extra innings.

Cedric Mullins drove in Ramon Urias from third with a sacrifice fly to center off Jonathan Loaisiga to win it in the 10th, with Aaron Hicks’ throw coming up short and sailing well wide of the plate.

Urias started the inning on second as the extra runner and was bunted over to third by Pat Valaika before Mullins won it with the fly ball.

In the top of the inning, the Yankees couldn’t get extra runner Gio Urshela past second, with Tyler Wade failing to get a bunt down, Hicks unable to move him over and Mike Ford striking out to end the inning after Gary Sanchez was intentionally walked.

Boone thought Wade shouldn’t have tried to be as “fine” with his bunt attempt against hard-throwing lefty Tanner Scott and just focused on getting the bunt down.

“I don’t think it’s been the greatest for us so far,” Boone said of the rule that puts a runner on second to start extra innings. “We know the situation. That’s the rule. We’ve got to play with and get it done.”

The Yankees — who fell to 1-4 in one-run games and 1-3 in extra innings — had their chances earlier, including in the top of the ninth.

Ford, pinch hitting for Clint Frazier, led off with a walk and after Brett Gardner struck out looking, DJ LeMahieu drew another walk. Giancarlo Stanton, who hit the ball hard throughout the afternoon, struck out swinging before Gleyber Torres ripped a two-out, 1-2 pitch for a ground-rule double to left-center to score Ford and tie the game.

The Yankees would have gone ahead if the ball hadn’t bounced over the fence, as LeMahieu would have been able to come home easily.

“As that ball is flying, you’re like, ‘Hit the wall,’ ” Boone said. “But it skips over. If it stays in, it probably scores two.”

Urshela then lined out to short to end the inning, and as has often been the case this season, the Yankees weren’t able to overcome it.

There was plenty that went wrong Thursday, from Boone letting Jordan Montgomery face Trey Mancini to lead off the bottom of the sixth even with Chad Green up in the bullpen.

Montgomery had already allowed two hard-hit singles to Mancini and in the third at-bat, Mancini ripped a cutter for a home run that tied the game after Rougned Odor’s two-run single had given the Yankees the lead in the fifth.

“Trey’s been really hot right now,” Montgomery said. “I couldn’t get him out today.”

Boone defended the move, saying “it’s a long season. You’ve got to lean on your starters during everyday stretches. You can’t just run to the best matchup in the middle of a game every time. You want your starter to push through certain situations.”

There’s truth to that, but with Green already warming, Montgomery’s day was nearly over and no one hurt him more than Mancini.

Green came on after Montgomery left and threw two more dominant scoreless innings before Darren O’Day came in for the eighth.

O’Day allowed a leadoff single to Mullins and then a double to left-center to Austin Hays. Mullins came around to score the go-ahead run before the Yankees rallied in the ninth.

Aroldis Chapman struck out the side in the bottom of the ninth to extend the game.

A few more hits in certain situations would have helped.

After they left two runners on in the third, they got another pair on in the fourth, but Frazier’s fly ball to right only got to the track.

With two outs and the bases loaded in the fifth, Odor delivered another go-ahead hit, his fourth of the season, with a single to right.

Boone elected to pinch hit Aaron Judge for Odor against left-hander Paul Fry following Urshela’s leadoff walk in the eighth, but Judge struck out.

In all the Yankees left a dozen runners on base.

“I feel like we’re moving in the right direction,’’ Boone said. “We got shut down a little bit today. We start an important homestand [Friday] with Gerrit [Cole] on the mound.”