LeBryan Nash scored a career-high 29 points and had nine rebounds to help No. 11 Oklahoma State beat West Virginia 81-75 on Saturday.
Nash was 10 of 13 from the field for the Cowboys (16-3, 4-2 Big 12), who swept the season series with the Mountaineers.
Markel Brown had 15 points and 10 rebounds and Phil Forte added 13 points for Oklahoma State, which now can focus on a showdown at No. 25 Oklahoma on Monday.
The Cowboys won despite a subpar performance from star guard Marcus Smart. The sophomore scored a season-low five points on 1-for-7 shooting and played just 25 minutes before fouling out.
Eron Harris scored 21 points and Juwan Staten added 19 for the Mountaineers (11-9, 3-4), who have lost four of five.
Oklahoma State made just 4 of 24 3-point attempts and was outrebounded 41-35, but held the Mountaineers to 37 percent shooting.
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