CORVALLIS, Oregon (Ticker) -- Behind the strong shooting of David Lucas, Oregon State did not fade down the stretch.
Lucas scored 17 of his 23 points in the second half and Nick DeWitz finished with 20 as the Beavers held on for a 90-73 victory over No. 11 Washington in a Pac-10 Conference matchup.
With the loss, Washington (20-4, 10-3 Pac-10) fell a full game behind Arizona in the conference standings. Arizona defeated UCLA, 83-73, on Saturday.
Last season, the Huskies rallied from a 16-point deficit for a 103-99 win here behind 25 points by Nate Robinson, including 23 in the second half. In this one, Lucas scored six of the game's first eight points after halftime to push a seven-point lead to 52-37 with 17:20 to play.
After a 3-pointer by the Huskies' Tre Simmons cut the deficit to 59-48 about 3 1/2 minutes later, Lucas scored six straight points for the Beavers and DeWitz added a dunk to make it 66-50 with 12:22 left.
Lucas shot 9-of-12 from the field with 10 rebounds and DeWitz had two 3-pointers for Oregon State (14-9, 6-6), which shot 60 percent (33-of-55) in its first win over Washington in four tries.
After the Huskies opened the game with a 27-20 lead with 8:53 left, the Beavers went on a 10-3 run over the next three minutes to tie the game at 30-30 on a pair of free throws by J.S. Nash. Nash added three more free throws in the next 1:40 to give Oregon State a 33-32 lead with 4:24 remaining.
Nash, a reserve guard, scored all 18 of his points in the first half to lead the Beavers to a 44-37 lead at the break.
In support of Lucas, Chris Stephens chipped in 12 of his 17 points in the second half for Oregon State, which captured its third straight win to record its most wins in a season (14) since its went 15-16 in 1991-92.
Brandon Roy scored 25 points and Simmons chipped in 15 for the Huskies, who shot 15 percent (4-of-27) on 3-pointers and committed 18 turnovers.
Coming off a game where he scored 12 of his 17 points in the final six-plus minutes of a 95-88 overtime victory at Oregon on Thursday, Will Conroy had just six points, going 0-of-4 from the arc for Washington.
Robinson, the Huskies' leading scorer at 16.7 per game, also struggled, shooting just 4-of-11 from the field.