AUGUSTA — Led by a double-double from junior guard Elise MacNair, fifth-seeded Old Orchard Beach ousted defending regional champion Winthrop with a 44-35 victory in a Class C South girls’ basketball quarterfinal Tuesday night at the Augusta Civic Center.

Old Orchard Beach led most of the game, but it was close throughout. A pair of free throws by MacNair with 38.9 seconds remaining gave the Seagulls (16-3) a 41-35 cushion and helped them secure a spot in the semifinals on Thursday.

“It was a rock fight,” said Old Orchard Beach Coach Dean Plante.

MacNair finished with 14 points and 13 rebounds.

“Our game plan going into it, it took a team effort tonight,” said MacNair. “Our coaches put together such an in-depth scouting report, and our teammates executed what we wanted to do on the court today.”

Tessa Ferguson added 12 points for the Seagulls.

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Nobody reached double figures for fourth-seeded Winthrop (13-4), which was held to eight field goals. Lydia Rice led the Ramblers with nine points.

HALL-DALE 50, TRAIP ACADEMY 36: Hayden Madore led the top-seeded Bulldogs (19-0) with 14 points in a Class C South quarterfinal win over the eighth-seeded Rangers (11-9) in Augusta.

The score was tied 11-11 after one quarter, but Hall-Dale steadily pulled away from there as it advanced to a semifinal Thursday against Old Orchard Beach.

Emme Hale scored 15 points for Traip.

North Yarmouth Academy’s Sarah English, right, looks to shoot against Phoebe Simpson of Kents Hill during a Class C South girls’ basketball quarterfinal Tuesday at the Augusta Civic Center. Joe Phelan/Kennebec Journal

NORTH YARMOUTH ACADEMY 52, KENTS HILL 33: Graca Bila scored 15 points, Sarah English added 14, and the third-seeded Panthers (16-2) fought off a challenge from the sixth-seeded Kents Hill (10-5) in a Class C South quarterfinal in Augusta.

Madilyn Onorato chipped in with nine points on three 3-pointers for NYA, which led throughout but didn’t break it open for good until the fourth quarter, when it outscored the Huskies 14-4.

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The Panthers will play No. 2 Carrabec on Thursday afternoon.

Logan McDonald and Regina Sabirova each scored 11 points for Kents Hill.

CARRABEC 52, MADISON 31: The second-seeded Cobras (15-2) limited No. 10 Madison (11-9) to four field goals in the second half as they advanced to the Class C South semifinals in Augusta.

Cheyenne Cahill paced Carrabec’s balanced offense with 14 points. Brooke Welch had nine points, and Julia Baker and Molly Hoy chipped in with eight apiece.

Raegan Cowan led Madison with 10 points.

DEXTER 37, CALAIS 24: Hannah Dean scored 10 points to led the seventh-seeded Tigers (12-6) to an upset over the second-seeded Blue Devils (15-4) in a Class C North quarterfinal at Bangor’s Cross Insurance Center.

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Abilene Corson added eight points for Dexter, which will face Penobscot Valley in the semifinals on Friday.

Sage Phillips paced Calais with eight points.

PENOBSCOT VALLEY 38, FORT KENT 24: Kaya Loring scored 21 points as the third-seeded Howlers (16-3) beat the No. 6 Warriors (10-8) in a Class C North quarterfinal in Bangor.

Fort Kent’s Lily Oliver was the only other player in double figures, finishing with 14 points.

HODGDON 53, CENTRAL 32: The fifth-seeded Hawks (16-3) got 19 points from Anna Oliver and 17 from Marissa Dow in a Class C North quarterfinal win over the No. 4 Red Devils (16-4) in Bangor.

Dow finished with five 3-pointers, making at least one in each quarter.

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Izzy Allen paced Calais with 18 points.

STEARNS 61, SUMNER 27: Mikayla Anderson scored 13 of her 24 points in the first quarter to help the top-seeded Minutemen (14-3) to an early lead on the way to a Class C North quarterfinal victory over the eight-seeded Tigers (11-7) in Bangor.

Anderson made three 3-pointers in the first quarter, when Stearns built a 23-2 lead. She added 11 points in the third quarter as the Minutemen stretched their advantage to 54-15 with a 22-5 run.

Alisyn Alley added 10 points for Stearns.

Rachel Colby led Sumner with 10 points.

BOYS’ BASKETBALL

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MEDOMAK VALLEY 77, MARANACOOK 48: Trevor Brown scored 13 points and three teammates added 10 apiece as the fourth-seeded Panthers (17-4) routed the No. 9 Black Bears (10-9) in a Class B South semifinal at the Portland Expo.

Patrick McKenney, Jake Bickmore and Gabe Lash also reached double figures, and Jacob Craig and Finn Parmley each finished with eight points as Medomak advanced to the regional final against No. 2 Yarmouth.

Tyler Hreben scored 14 points and Brayden St. Pierre had 10 for Maranacook, which was knocked off top-seeded Spruce Mountain in the quarterfinals.

DEXTER 67, LEE ACADEMY 39: Will Kusnierz sank six 3-pointers and scored 29 points as the fourth-seeded Tigers (14-5) cruised past the fifth-seeded Pandas (10-6) in a Class C North quarterfinal at Cross Insurance Center in Bangor.

Seth Robbins added 15 points for Dexter, which next faces No. 1 Fort Kent on Friday.

Andrew Scott led Lee with 15 points.

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FORT KENT 59, CALAIS 39: Alex Delisle scored 28 points and Ethan Daigle had 25 as the top-seeded Warriors (19-1) cruised to a win over the No. 8 Blue Devils (10-9) in a Class C North quarterfinal in Bangor.

Daigle got Fort Kent off to a good start, hitting three 3-pointers and scoring 13 points in the first quarter as the Warriors built a 17-9 lead.

Calais then opened the second quarter with a 9-0 run, but Fort Kent quickly regained control and led 35-25 at halftime.

Jace Cook scored 11 points for Calais.

– Travis Barrett of the Kennebec Journal contributed to this report