Aliyah Bureau scored the winning goal with 18:39 remaining as the ninth-seeded Trojans (9-5-1) beat the eighth-seeded Spartans (7-8) in a Class A South prelim in Sanford.

Thornton took a 1-0 lead with 11:47 left in the first half on a goal by Jaigan Boudreau, assisted by Cat Henaire.

Sanford tied it just before halftime when Ruby LaChance converted a penalty corner from Kim Works.

Jenica Botting finished with six saves for the Trojans. Sanford’s Jordan Benvie had five saves.

Thornton moves on to play top-seeded Biddeford in the quarterfinals at 5:30 p.m. Tuesday.