Washington State (5-4) opened with a 10-0 run and led by as many as 16 in the first half, taking a 41-26 lead at intermission. The Cougars never trailed in the game.
Pepperdine (6-5) cut the lead to seven, 61-54 with just under eight minutes to play, but went suddenly cold from the field, converting just two field goals the final seven minutes.
Pepperdine shot only 38 percent from the field, well below its season average. The Cougars shot 53.6 percent from the field (30-56) for their best shooting performance of the season.
Jeremy Major had 17 points for Pepperdine and Stacy Davis added 12 points.