The Cold Spring Harbor sideline couldn’t believe the saves Abbey Ngai was making.

“Insane,” Caroline Kiernan said. “Absolutely insane.”

“She was a showstopper,” coach Danielle Castellane said.

The junior goalie, who has committed to Boston College, made 13 saves Thursday in a 10-4 win over visiting Garden City in a Nassau I matchup of girls lacrosse powerhouses.

Garden City struggled to find its footing offensively, as the Seahawks’ defense was staunch against Michaela Bruno, Katie Muldoon, Brooke McDaid, Kerry Defliese and Jenn Mejdid, one of Long Island’s top scoring units.

“It’s probably the best I’ve ever played,” Ngai said. “I watched a bunch of film last night. I just had to memorize every single little detail they would do so I could pinpoint it right on the spot and make the next save.”

advertisement | advertise on newsday

She anticipated nearly every dodge, cut and feed.

As the saves piled up, the Seahawks couldn’t contain themselves. Ngai’s teammates looked at each other in disbelief after each stop. After Ngai’s first half, they should have expected it. Ngai allowed a goal to Defliese midway through the first after the Seahawks opened on a 3-0 run. But Cold Spring Harbor (4-2) built an 8-1 lead between Defliese’s goal and Garden City’s next score with 6:37 left in the game, a Muldoon goal off a feed from McDaid.

Ashley Lynch’s two goals and five assists and Katie Hudson’s three goals provided the punch for the Seahawks.

Bruno and Kelly Aneser added goals with less than 1:30 left to provide the final margin. Ngai made eight saves in the second half to keep Garden City (3-1) at bay.

The defense in front of Ngai was crisp. They recognized cutters, made good slides and prevented attackers from getting in the crease. Ngai took care of the few who did pass through.

Kiernan was integral in keeping the pressure off the defense. She won a game-high seven draws and established possession in key spots. “Possession meant so much to us today,” she said. “We held the ball well, moved it up the field, and rode against them very well.”

And when the Seahawks didn’t have possession, Ngai took center stage. Sometimes in unbelievable fashion.

“You want your goalie to make the saves she’s supposed to make, and then you want her to make some you don’t expect,” Castellane said. “That’s what she did today.”