AMES, Iowa -- Oklahoma's stay at the top will be short-lived.

A jumper by guard Monte Morris with 21.4 seconds left sent No. 19 Iowa State to an 82-77 win over the No. 1 Sooners the same day Oklahoma moved into the top spot for the first time since 1990.

It was Iowa State's first win over a No. 1-ranked team since 1957, when the Cyclones downed Wilt Chamberlain-led Kansas 39-37.

Oklahoma (15-2, 4-2 Big 12) hasn't won in Ames since 2011.

After Morris' jumper, the Sooners attacked the basket. However, guard Buddy Hield's shot missed the mark, and guard Isaiah Cousins' 3-pointer bounced off the front of the rim and was scooped up by Morris.

Morris was fouled and hit his free throws.

Cousins sank a layup with four seconds left to pull the Sooners within two points, but a technical foul against Oklahoma for touching the ball out of bounds on the ensuing inbounds play all but sealed the outcome.

The Cyclones sank three free throws in the last seconds to account for the final margin.

Iowa State's fans stormed the court for the second time this season. They also did it after a Dec. 10 win over rival Iowa.

Forward Georges Niang led the Cyclones (14-4, 3-3) with 22 points. Morris and forward Abdel Nader added 20 apiece, and forward Jameel McKay had a game-high 13 rebounds. Iowa State outrebounded the Sooners 43-32.

Hield led the Sooners with 27 points, while Cousins had a career-high 26.

For the second consecutive game, forward Dante Buford gave the Sooners a spark off the bench. He scored a career-high 14 points, including a desperation 3-pointer from just inside midcourt with just more than nine minutes remaining.

The shot put the Sooners ahead for the first time since late in the first half.

The Cyclones immediately answered with a Niang 3-pointer, igniting a 10-0 run that seemingly allowed Iowa State to regain control.

Just as quickly, though, Oklahoma tied it up. Hield hit a pair of 3-pointers to knot the game at 67 with less than four minutes to play.

Niang took over near the end of the first half to give the Cyclones a 41-35 lead at the break.

Niang had been mostly quiet during the first 15 minutes, scoring just four points. however, after Isaiah Cousins' 3-pointer with just more than five minutes remaining put Oklahoma up by four, Niang took over.

He scored 10 in a 14-4 run to close the half.

Earlier in the half, it had been Nader who helped keep the game tight, scoring 10 points in the first 11 minutes.

NOTES: Iowa State's Hallice Cooke returned from a one-game suspension for violation of team rules, but he didn't get off the bench. ... The game was the final regular-season meeting between Iowa State F Georges Niang and Oklahoma G Buddy Hield. Hield and Niang met as high schoolers and have regularly roomed together at offseason camps. ... Oklahoma plays at No. 13 Baylor on Saturday. ... Iowa State travels to TCU the same day.