Dallas ? Trisha Skibbe made two free throws with 18.1 seconds left as Oklahoma State upended sixth-seeded Missouri, 56-54, Tuesday night in the first round of the Big 12 Conference women’s tournament.

After Skibbe made her foul shots, Missouri had a final chance to tie or win, but Tracy Lozier missed a three-pointer and Evan Unrau couldn’t convert the tip.

Eleventh-seeded Oklahoma State (8-20) held off a late push by Missouri (15-13) by hitting 6-of-8 free throws in the final six minutes.

“We got relaxed, then it got fun,” said senior guard Meghan Craig, who scored 12 points for OSU. “We were right there with them. They had more on their shoulders in this game and we had nothing to lose.”

Skibbe finished with 14 points and 14 rebounds, and Thia Willis had 12 points.

Oklahoma State managed to win in the day’s most dramatic game despite being outrebounded 47-30, committing 22 turnovers and shooting 35 percent (17-of-49) from the field.

The Cowgirls trailed 42-35 with 11:25 left when they started to work their way back into the game. Craig hit a three-pointer and Chantoya Hawkins made four straight free throws to tie up the game at 42. The Cowgirls scored the go-ahead basket on Willis’ three-pointer, which gave them a 48-46 lead with 6:58 remaining.

Missouri was led by Unrau’s 18 points and 14 rebounds, while Stretch James added 16 points and 12 rebounds.

The Cowgirls will face third-seeded Texas Tech in today’s quarterfinal round. They lost both regular-season games against Tech.

Oklahoma 71, Nebraska 51

Dionnah Jackson scored 14 points and Maria Villarroel had 13 to lead a balanced attack as Oklahoma beat Nebraska.

Oklahoma center Becky Preston, left, fights for the ball with Nebraska forward Alexa Johnson during their Big 12 tournament game. The Sooners won the first-round game Tuesday in Dallas.

Fifth-seeded OU (19-11) pulled away from the Cornhuskers (8-20) after halftime, running off nine straight points to take a 36-19 lead.

OU center Theresa Schuknecht scored all 12 of her points in the second half.

“We really competed and shared the ball offensively,” Oklahoma coach Sherri Coale said. “That’s exactly what you need at this time of year.”

The Sooners, Big 12 champions and NCAA Tournament finalists last season, have won four of their past five games. Oklahoma will face fourth-seeded Colorado today. It was a merciful end to a disappointing season for first-year Nebraska coach Connie Yori.

Baylor 80, Texas A&M 61

Sophia Young scored 25 points and Steffanie Blackmon had 22 as Baylor overcame early shooting struggles.

Baylor’s inside duo of Blackmon and Young ignited a 23-5 run to start the second half, allowing the Bears (20-9) to rally from a 31-22 halftime deficit.

Texas A&M (10-18) ended its season on a six-game losing streak. Baylor will play second-seeded Kansas State today.