Martin finished with 14 points, including nine straight during a key run in the second half. The Highlanders trailed by 14 with 7:05 remaining.
Harrison Gaines had 13 points and Elliott Berry added 10 for Riverside (2-4). The Highlanders had lost four straight.
After Riverside took its first lead on Gaines' baseline runner, DaVonte Lacy stole the ball from Martin at midcourt and completed a three-point play with 35 seconds remaining to put Washington State back in front, 63-62.
Brock Motum scored 15 points and Faisal Aden had 14 for the Cougars (2-4), who made their first five shots for a 13-3 lead.
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