Ethan Thompson scored a game-high 19 points, making 12 of his 14 free-throw attempts, as Oregon State upset No. 21 Oregon 75-64 Saturday in Pacific-12 Conference play in Eugene, Ore.Warith Alatishe added 14 points and 16 rebounds for the Beavers (8-5, 4-3 Pac-12), who held a 42-23 edge on the boards. Teammate Jarod Lucas scored 11 points.The Ducks (9-3, 4-2), who were playing their first game since Jan. 9 after having to shut down the program for a week because of coronavirus concerns, were still without leading scorer Chris Duarte and swingman LJ Figueroa, who have yet to clear COVID-19 protocols. Duarte and Figueroa combine to average 28.5 points per game.Oregon was unable to make up for their production. The Ducks’ last lead was at 7-6, and they missed 10 consecutive field-goal attempts in the first half while falling behind 28-15.The Ducks made their final five shots of the first half to pull within 34-28 by the intermission.Oregon tied it at 34-34 early in the second half on a 3-pointer by Jalen Terry, but the Beavers used an 8-0 run to pull away again, and the Ducks never got closer than six points the rest of the way.