Buddy Hield scored 18 points and Isaiah Cousins added 17 to help Oklahoma beat Kansas State 86-73 and clear up the Big 12 standings with four games remaining in league play.
The runaway win helped break a three-way tie for third with Oklahoma, Kansas State and Iowa State all entering the day with 8-5 league marks. Iowa State's 71-60 Saturday win over TCU kept the Cyclones knotted with the Sooners.
Oklahoma (20-7, 9-5) dominated in nearly every category, leading by as many as 27 points in the second half.
The Sooners took their first lead 3 minutes in when Hield drained a 3-pointer following a Kansas State turnover. From there, Oklahoma outscored the Wildcats 34-17 to lead 41-22 at the half.
Cameron Clark scored 11 and Jordan Woodard added 10 for the Sooners, who have won three of their last four games going into Monday night at Kansas.
Marcus Foster led Kansas State with 21 points. Nigel Johnson scored 11 and Thomas Gipson added 10.
The Wildcats (18-9, 8-6) lost their sixth consecutive road game and are 1-6 in away league games.
Kansas State dug a hole early it couldn't climb out of, committing 10 first-half turnovers and shooting 39 percent with no starter scoring more than five points.
Oklahoma turned those turnovers into 17 points and controlled the tempo, outrebounding Kansas State 21-15 in the half and 32-28 for the game.
The Wildcats outscored Oklahoma 51-45 in the second half but it wasn't enough in what has been a difficult season away from home.
The Wildcats have done some of their best work this season at home inside Bramlage Coliseum -- winning their last 14 games, including beating No. 15 Texas and No. 7 Kansas.
Saturday's game was a much different story than when the two teams met in Manhattan, Kan., on Jan. 14. Kansas State led 39-38 after the first half and came from behind in the final 5 minutes to win 72-66 with five different players scoring in double figures.
Saturday, the Wildcats didn't have a player reach double-figure scoring until 7:51 remaining when Foster hit his second 3-pointer of the afternoon.
Both Oklahoma and Kansas State play two of their final three games at home.