WSU downs Oregon State 3-1 overall to remain undefeated at home.
WSU picks up the victory over Oregon at home, with the last occurring inside Bohler Gym in 2005.
Jocelyn Urias and Pia Timmer power the Cougars ahead of the Trojans on the road.
First match of the Los Angeles trip ends in defeat for WSU.
Cougars face UCLA and USC as Pac-12 competition continues.
Cougars fall on the road to the Golden Bears 3-2.