SPOKANE — Washington State wasn't very worried about Oregon's Olu Ashaolu going into Thursday night's Pac-12 men's basketball opener. The Cougars should have been.

Ashaolu, a 6-foot-7 transfer from Louisiana Tech, scored 23 points and grabbed 10 rebounds as the hot Ducks beat Washington State 92-75 before a crowd of 9,889 at Spokane Arena.

Ashaolu, who was 9 of 11 from the field, moved down low after spending more time on the perimeter in previous games.

"That's what I call home on the basketball court," he said.

Oregon shot 69 percent from the field (34 of 49) and never trailed.

"We are playing like it's conference time," Ashaolu said. "Things just took off."

Devoe Joseph added 17 points for Oregon (10-3), which won its fourth straight. E.J. Singler added 13 points and Garrett Sim had 12 for the Ducks. Oregon freshman Brett Kingma of Mill Creek's Jackson High School hit 3 of 4 three-point attempts for nine points.

DaVonte Lacy scored 19 for Washington State (8-5), which shot 46 percent from the field and had a six-game winning streak snapped.

Washington State fell behind by 20 at halftime as Oregon shot 71 percent in the first half.

"We are better than that," Cougars coach Ken Bone said. "We know it. Our guys know it."

But Oregon's fast start and hot shooting left the Cougars frustrated, he said.

"That first half, they put on a clinic on offense," Bone said.

Oregon shot 9 of 16 on three-point attempts and out-rebounded the Cougars 34-22.