Old Orchard Beach celebrates defeating Winthrop in the Class C South girls basketball quarterfinals Tuesday at the Augusta Civic Center.

Winthrop's Rhyan Sawlivch (5) and Ella Rice (3) try to defend Old Orchard Beach's Abby Roy (4) in the first half of a Class C South girls basketball quarterfinal Tuesday at the Augusta Civic Center.

Winthrop's Morgan Fichthorn (21) collides with Old Orchard Beach's Cate Clark (11) as they battle for the ball in the first half of a Class C South girls basketball quarterfinal Tuesday at the Augusta Civic Center.

Winthrop’s Morgan Fichthorn (21) collides with Old Orchard Beach’s Cate Clark, right, as they battle for the ball in the first half of a Class C South girls basketball quarterfinal Tuesday at the Augusta Civic Center.

Winthrop's Bella Littler hits her head on the court as she battles for the ball with Old Orchard Beach's Summer St. Louis in the first half of a Class C South girls basketball quarterfinal Tuesday at the Augusta Civic Center.

Winthrop's Ella Rice (3) drives past Old Orchard Beach's Abby Roy (4) in the second half in the Class C South girls basketball quarterfinals Tuesday at the Augusta Civic Center.

Winthrop’s Morgan Fichthorn (21) commits the offensive foul on Old Orchard Beach’s Abby Roy (4) in the second half in the Class C South girls basketball quarterfinals Tuesday at the Augusta Civic Center.

Winthrop’s Caroline Corgan (22) battles for the rebound with Old Orchard Beach’s Summer St. Louis (14) in the second half in the Class C South girls basketball quarterfinals Tuesday at the Augusta Civic Center.