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.
The Bulldogs trailed most of the first half, but ended it on an 11-5 run to lead 25-24 at the half.
Fresno State 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.
Maryland point guard Melo Trimble, considered a lock to leave the program before struggling in the second half last season, has withdrawn from the NBA draft and will return for his junior season.
Louisville's Chinanu Onuaku, who recently underwent a medical procedure to correct a heart rhythm issue detected during the combine, will keep his name in the NBA draft pool.
Andrew White III will return to the Nebraska men's basketball team next season after removing his name from the NBA draft.