Two clutch free throws each from Bryce Williams and Keylan Boone in overtime lifted host Oklahoma State to a 74-69 upset of No. 18 Texas Tech on Monday in Stillwater, Okla., to give the Cowboys the season sweep of the Red Raiders.

In another Big 12 Conference tilt chock full of plenty of March-like madness, the two teams went toe-to-toe and into overtime for the second time this season.

Terrence Shannon Jr. and Mac McClung both missed 3-point attempts on the possession after Boone's two makes, and Williams corralled the long rebound and hit his foul shots to ice the win.

Freshman Cade Cunningham led the Cowboys (15-6, 8-6 Big 12) with 20 points and came up with a key bucket and steal in overtime. Kalib Boone added 18 points and seven rebounds.

Shannon topped Texas Tech (14-8, 6-7) with 18 points, while McClung notched 17. But each was 1-for-5 from 3-point range.

The Red Raiders forged overtime with an alert play by Shannon. McClung missed a 3 with eight seconds to go in regulation, with Shannon tracking down a long rebound and then zipping a pass to Kyler Edwards for a layup with 2.8 seconds left.

Before the late drama, it took a big run for the Cowboys to rally back after Texas Tech opened the second half with a 10-0 run.

After missing its first nine floor shots of the half, Oklahoma State uncorked a 15-0 binge, fueled by 10 points from Avery Anderson. All that damage came after Cunningham was tagged with his fourth foul and had to go to the bench.

The Red Raiders claimed a narrow 37-36 halftime lead, with Shannon and Kevin McCullar each scoring 10 points. Oklahoma State shot the ball well (15 of 28) but launched only five 3-point shots in the opening 20 minutes, making one.

The Cowboys struggled from the free-throw line in the first half (5-for-10) but bounced back to finish 22-for-32, including 7-for-8 in overtime.

--Field Level Media