Richard Amardi added 15 points with eight rebounds and Mike Moser hauled down 15 rebounds to go along with 13 points for the undefeated Ducks (6-0), who held a 45-28 advantage on the boards.
Jason Calliste scored 15 points off the bench, and Elgin Cook had a double-double of 10 points and 10 rebounds as Oregon sank 58.9 percent of its shots.
Troy Huff provided a game-high 25 points, but went 0-for-7 from 3-point range for the Fighting Sioux (2-3).
Huff also grabbed nine rebounds and Aaron Anderson added 23 points for North Dakota.
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