It was a Casey Schmitt kind of night. The senior forward scored three goals, including the game-winner in the first overtime, as Mount Sinai defeated Harborfields, 3-2, in the Suffolk Class A girls soccer final Tuesday at St. Joseph’s College.

Schmitt, who scored the game’s first two goals, came through with 4:30 remaining in the first of two 10-minute overtimes.

“The ball was coming at me and all I could think about was scoring and getting ahead so we could relax and focus on keeping the defense good,” Schmitt said. “I turned, looked at the goalie, saw she was on one side, and shot it with my right foot. Thank goodness it went right in the corner. It was the greatest moment ever.”

The goal, while not exactly golden — with Mt. Sinai needing to hold Harborfields scoreless for another 15 minutes — advanced the Mustangs to the Long Island Class A final. They will face Garden City Friday at St. Joesph’s.

It’s been a magical ride for the Mustangs (12-3-2), who were seeded fourth in the Suffolk Class A tournament. In consecutive rounds, they have knocked off top-seeded Islip and second-seeded Harborfields (13-2-2).

“Every game we always talk about how everybody takes us for granted,” Schmitt said. “It’s good coming in as the underdog because they don’t take us seriously. But, today they did.”

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Schmitt scored in the 19th minute and another in the 28th to make it 2-0, but Harborfields stormed back. Caroline Rosales scored in the 38th minute and netted the equalizer on a fancy dribble, juke and shoot move in the center of the box in the 48th.

“It got me a little mad,” Schmitt said. “It’s hard when you’re winning and then all of a sudden, everyone thinks you’re going to win it all so you slow down a little bit. At halftime the coaches told us to stop taking them easy, put on hard pressure and score more goals. That’s what we did.”

Mount Sinai had a scare when a Harborfields shot hit off the crossbar with eight minutes remaining in the second overtime, dropping to the ground without inching over the goal line.

“Originally, I thought it was going over,” said Mount Sinai goalkeeper Caiya Schuster, who made 12 saves. “So I think it was a bit of a misread on my part. I’m really thankful it did hit the post, but once I saw that it went down, my only thought was to get it out.”