Washington State's defense forced 21 Ohio State turnovers -- leading to 16 Cougars points -- and held the Buckeyes to 1-for-17 from 3-point range.
"Exciting day for Washington State, after a tough road trip and back-to-back losses, the girls responded and came out and played physical, and aggressive," Cougars coach June Daugherty said. "Tonight we had some hustle plays that really mattered I give all the credit to our defense."
Washington State (3-5) led 28-23 at halftime. Ohio State came back to lead 36-32, but the Cougars' defense forced three straight turnovers. Taylor Edmondson's 3-pointer put the Cougars ahead to stay at 40-37.
The Cougars never led by more than five points after that, but maintained the lead with strong defensive play in posting their first win over a ranked team since 2001. It was also the most points scored against the Buckeyes all season.
"We gave this team a lot of different looks on defense which created turnovers and they were just not comfortable with it," Daugherty said.
Ohio State (6-3) could have tied it in the final 30 seconds but missed on two chances and were forced to foul. Galdeira went 4 for 4 at the free-throw line.
Taylor Hill had 14 points for Ohio State, but missed all nine tries from behind the arc, including two in the final seconds. Ashley Adams had 12 points and 11 rebounds, and Amber Stokes scored 12 for the Buckeyes.
"Washington State pressured us defensively and none of our guards responded to the challenge. Top to bottom," Ohio State coach Jim Foster said. "We needed to come out and play hard from the start and we didn't do that."
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