Kaylee Jensen had 23 points and 12 rebounds, Mandy Coleman scored 14 points and grabbed 18 boards and Oklahoma State withstood Kansas' fourth-quarter rally for a 79-75 win in the first round of the Big 12 Conference Tournament on Friday night.
The seventh-seeded Cowboys move on to play second-seeded and No. 12 Texas on Saturday.
Areanna Combs' layup with 8:52 to play put the Cowboys up 60-47. Kansas used a 17-7 run to pull within three on Jayde Christopher's layup following her steal with four minutes left, but the Jayhawks failed to get closer.
Oklahoma State (17-13) led 34-29 at intermission, and Chayla Cheadle started the third quarter with a 3-pointer for the Jayhawks. Karli Wheeler later added a pair of free throws to push the Cowboys' advantage to 48-38.
Diana Omozee scored 21 points and had eight rebounds for the Cowboys, who amassed a 53-24 rebounding advantage with 20 coming on the offensive end for 22 second-chance points.
Jessica Washington and Kylee Kopatich each scored 18 points and Jada Brown had 14 for Kansas.