The Bruins saw their five-match winning streak snapped.
Cougars sweep Liberty to start the season 3-0 inside Bohler Gym.
WSU continued to roll through opponents at the 2019 Cougar Challenge.
The Bruins have won five in a row, all by sweep.
The first match inside Bohler Gym this season sees the Cougars beat Idaho State.
A pair post double-doubles in Bruins' fourth win in a row.