Oregon stars LaMichael James and Darron Thomas returned from injury but true freshman De'Anthony Thomas sparked the No. 7 Ducks with two second-half touchdowns in a 43-28 victory over Washington State on Saturday.
Darron Thomas, who missed a game because of a knee injury, returned to start against the Cougars but threw two interceptions in the first half and was replaced by backup Bryan Bennett in the second.
Washington State (3-5, 1-4 Pac-12) lost its fourth straight. The Cougars hung tough with Oregon for much of the game and trailed by only 15-10 at the half.
Lavasier Tuinei caught two touchdown passes for Oregon (7-1, 5-0), which has won 21 straight games at Autzen Stadium. The Ducks have also won 17 straight conference games.