Woolridge hit five 3-pointers and Motum three, helping the Cougars (13-18, 4-14 Pac-12) to their first winning streak in conference play this season with a sweep of the Los Angeles schools. Washington State defeated UCLA on Wednesday.
T.J. Terrell had 18 points for the Trojans (14-17, 9-9). He was the only player in double figures for USC, as it struggled from the field (19 for 56) and behind the arc (4 for 24).
Washington State never trailed and put the game out of reach when Woolridge hit four consecutive 3-pointers to make the score 66-46 with 4:42 remaining.
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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point guard Melo Trimble, considered a lock to leave the program before struggling in the second half last season, has withdrawn from the NBA draft and will return for his junior season.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.