Washington was led by Noah Dickerson's 28 points and 12 rebounds.
Eubanks ushered in his name to the 1,000 career point club, the 41st Oregon State player to do so.
Oregon State played the Washington Huskies for the 300th time on Saturday. The Ducks finished with 61.5 percent shooting in the game.
Hebard topped her career high set last season when she had 29 points against UCLA. Senior forward MiKyle McIntosh and freshman guard Victor Bailey Jr. scored 13 points apiece, and freshman forward Kenny Wooten contributed 10 points and eight rebounds.
Mazyck was 9 of 17 from the floor and made four 3-pointers, and Simon was 8-of-17 shooting.
"I thought their energy was really good", Altman said of the young group.
The Ducks finished the game on a 14-0 run for their largest lead.
Kalmer and McWilliams also made two 3s each in the first half. "He and Troy had 13 assists between them so that was a big key making plays for others".
It was the Huskies' fourth loss by more than 20 points this season. Despite missing just one shot in the opening 10 minutes, OR held just a six-point lead after one quarter of action thanks to 11 points, including a trio of threes, from Alexys Swedlund. His top play was a back-court steal with a behind-the-back dribble to avoid a Cougar and a driving finish over Drick Bernstine for a 3-point play and a 63-48 lead.
As a team, the Beavers shot 17 for 30 from the floor, including 12 for 19 from 3, to go with the 6-for-7 performance from the free-throw line. The first OR foul of the game was made by MiKyle McIntosh with 9:21 remaining in the first half. Kenny Wooten had a key block with just over a minute left in the first half and OR turned it into a quick five points to take a 38-28 lead.
Halftime-Oregon 38-28. 3-Point Goals-Washington St. 10-28 (Daniels 3-7, Skaggs 3-7, Flynn 2-8, Chidom 1-1, Shpreyregin 1-4, Acquaah 0-1), Oregon 11-28 (Pritchard 3-6, McIntosh 2-4, Bailey 2-4, E.Brown 2-8, White 1-1, T.Brown 1-4, Kigab 0-1). "If we make some of those point-blank layups that we missed, maybe it's a 10-point game and puts a little more pressure on them". "That's what we talked about before the game was basketball feels good and is fun when you are getting stops". "I don't think we're playing great ball". However, the Ducks still owned a 10-point lead going to the fourth quarter, 66-56. The Ducks took a ten point lead into the locker room. "That's how we need to play all the time". OR pulled away late in the first as the Ducks continued to shoot the ball well, going 12-of-13 to own a 26-20 lead.
The Huskies (7-18, 1-13), who reached their first Final Four in 2016 and lost in the Sweet 16 last season, have lost six in a row and 13 of their last 14.
"Our first half defense left a lot to be desired", Daugherty said. However, the Cougars couldn't get any closer than nine throughout the fourth quarter. The Huskies (7-18, 1-13) head to Colorado on Friday. Despite falling behind by as much as 23 points to start the second half, the Cougs fought back, using a 15-2 run capped by a Borislava Hristova three to cut the deficit to just nine late in the third.
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