Katie Muldoon froze a defender with a sudden momentum shift from right to left and ran a few yards up the field before drawing a free position attempt from the 12.

She would not be interrupted again.

Muldoon ran ahead and put her team up by three goals about 12 minutes before halftime. She wound up with five goals and two assists as Garden City beat defending state champion Eastport-South Manor, 10-6, to win the Long Island Class B championship Sunday at Stony Brook University.

The Trojans (19-1) will face Victor in the state semifinals Friday at noon at SUNY Cortland.

“This is huge for our team,” said Muldoon, one of 17 Garden City seniors.

She deferred credit to her teammates. “Our whole team was playing smart,’’ she said. “They cut for me, I cut for them. Whatever works is how we play. From game to game, we don’t rely on anyone. We work as a team, and that’s what got us to where we are today.”

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Garden City moved the ball well through the first few minutes. Eastport-South Manor’s Dayna Martinetto (11 saves) denied multiple shots off quick passes, making two stops from point-blank range in the opening three minutes to keep the game scoreless.

The Trojans took a 4-0 lead with 9:13 left in the first half behind goals by Muldoon, Brooke McDaid, Celia Concannon and Jackie Brattan and contained ESM standouts Kelsey Huff and Kaeli Huff with defensive slides and strong one-on-one play. Garden City goalie Juliana Kubler also impressed with eight saves.

Kelsey and Kaeli Huff scored to make it 4-2 at the half, but Muldoon notched three of the next four goals to widen Garden City’s lead to 7-3 with 14 minutes left. Delaney Schappert and Kaeli Huff added goals for ESM (14-5) in the final two minutes, but the Trojans held on.

“We were able to get a lead and keep it, but they kept trying to come back,” Garden City coach Diane Chapman said. “I thought our goalie had some incredible saves, and even though their center was controlling the draw, we were able to get possession a lot.”

Added Kubler: “Everyone passed, no one was selfish with the ball, we had great team chemistry and everybody stepped up and played their best today. It’s a dream. It’s an amazing feeling.”