The sophomore guard scored a career-high 25 points and was 7-for-7 from three-point range.
After falling behind 20-10 in the first half, Texas Tech (10-9, 2-4) went on a 16-0 run to jump in front of the Mountaineers 26-20.
West Virginia would start the second half on a 7-0 run and never look back.
The Mountaineers' Terry Henderson scored 20 of his 28 points in the second half.
Texas Tech hosts No. 25 Oklahoma at 3 p.m on Saturday.
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