Washington State committed 22 turnovers and shot just 22 percent in the second half.
Marcus Capers heaved in a 60-foot shot that beat the halftime buzzer and gave Washington State a 40-38 lead.
Brock Motum led Washington State (2-2) with 13 points. Faisal Aden had 12.
Washington State will play New Mexico in the consolation round Friday. The Sooners will face Santa Clara in the semifinals.
Calvin Newell shot 7 of 13 and hit four 3-pointers, and Steven Pledger added 14 points on three 3s.
Oklahoma trailed by a point when Newell took over. He accounted for all but three points of a 13-2 run, capping it with a 3-pointer for a 60-50 advantage with 7:15 remaining.
HOOPS: Second half nightmare for Cougs
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