The Cougars (6-4) led 48-47 with 4:43 to play. Motum made two layups and Ladd scored on another and Washington State was up 54-48. Royce Woolridge, who scored 11 points, made five of his six free-throw attempts to wrap up the win. The final score matched Washington State's largest lead.
Washington State struggled in the first half, trailing 25-24, and shooting only 33 percent (8 for 24). Motum was the only Cougar to score in the last 13 minutes of the half.
"Ultimately I would like to have eight players score 10 points each - that would make us harder to guard and less predictable - but it is not an equal-opportunity thing so we end up going to our top players to a fault," Washington State coach Ken Bone said.
Jerry Brown scored 12 points while Robert Upshaw and Allen Huddleston each scored 10 for Fresno State (5-4). Upshaw also had seven rebounds and six blocked shots.
The Bulldogs trailed most of the first half, but ended it on an 11-5 run to lead 25-24 at the half.
"We did not play well in the first half, and we didn't play great in the second, but we managed to play well defensively and that made the difference," Bone said.
Fresno State, which committed 14 turnovers, shot only 26 percent in the second half and 30 percent for the game. Washington State shot 47.8 percent in the second half and 40 percent overall.
"They (Washington State) are an older team compared to us. They threw a lot of defenses at us, and even though we were ready for it, we struggled and ended up forcing shots and not scoring a decent percentage," Fresno State coach Rodney Terry said.