From start to finish, the Cold Spring Harbor girls lacrosse team executed its game plan.

All-American Ashley Lynch, who had six goals and five assists in Wednesday night’s 14-3 win over No. 2 Oyster Bay in the Nassau Class C championship at Bethpage, said the plan in practice was to work on possession and focus on controlling the ball.

Their practices worked. The Seahawks opened the game with a 9-0 run and never were threatened.

“We’ve been preparing all week, practicing hard,” Lynch said. “We had a lot of possessions today, which is a lot of why we were able to capitalize.”

While the offense was the focal point, goalkeeper Abbey Ngai had a standout game.

Ngai made eight saves in the game and kept Oyster Bay off the scoreboard until there was 1:19 left in the first half.

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“If we want to win any type of championships — if we want to continue playing well in the playoffs — we need our goalie to make saves and we need our All-American to do good things with the ball,” coach Danielle Castellane said about the performances from Ngai and Lynch.

Other contributors for Cold Spring Harbor (12-5) included Caroline Debellis (four assists), Sophia DeRosa (three goals), Jillian Futter (two goals and two assists) and Emily Weld (two goals).

Shelby Cook, Jessica Layne and Maggie Frankel each had a goal for Oyster Bay (14-3).

Cold Spring Harbor will play Suffolk Class C champion Mount Sinai at 5:30 p.m. on Sunday at Stony Brook University in the Long Island championship.

The Mustangs defeated the Seahawks in the L.I. championship last season, and Lynch remembers it well.

“We’re hoping to get some revenge,” she said. “Last year was definitely really tough. We want that win.”