AMES, Iowa — Another No. 1 team came to the state of Iowa. Another No. 1 team left with a loss.

Georges Niang scored 22 points, Monte Morris added 20 and No. 19 Iowa State beat top-ranked Oklahoma 82-77 on Monday night, its first win over a No. 1 team since toppling Wilt Chamberlain’s Kansas Jayhawks in 1957.

Morris had a jumper, a key rebound and two free throws in the final 21 seconds for the Cyclones (14-4, 3-3 Big 12), who were actually slight favorites at home.

It was the third time a No. 1 team lost in the state of Iowa this season. Northern Iowa beat North Carolina and Iowa beat Michigan State.

Oklahoma’s Isaiah Cousins hit a 3 with 41 seconds left to tie the game at 75. But Morris drilled a step-back jumper for the lead, and Abdel Nader’s free throws with 3.1 seconds to go put it out of reach.

Buddy Hield scored 27 points and Cousins had 26 for the Sooners (15-2, 4-2), who moved to No. 1 earlier Monday for the first time in 26 years, but they could make a case for retaining the top spot with a win Saturday at No. 13 Baylor.

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Iowa State nearly beat Oklahoma on the road in the Big 12 opener earlier this month. The Cyclones led for 30 minutes, but Morris missed a wide-open 3 with 6 seconds left and the Sooners escaped 87-83.

This one was just as entertaining.

This time, Morris finished off the Sooners.

Matt Thomas drilled a 3 early in the second half to give Iowa State its first double-digit lead, 48-38. But the Cyclones came up empty on a few possessions that just might have put the game out of reach, and the Sooners rallied to jump back ahead 59-57 on a long, shot clock-beating 3 from Dante Buford.

Iowa State responded with 10 straight points, a run highlighted by Niang casually drilling a 3 to beat the shot clock for a 67-59 lead. The Sooners made it all up in 79 seconds though, setting up yet another thrilling finish.

Nader scored 20 points for the Cyclones, who won despite allowing Oklahoma to hit 10 of 16 3s in the second half.

Buford had 14 points for the Sooners.

TIP-INS

Oklahoma: The Sooners entered play ranked first nationally at 45 percent on 3s. Iowa State’s fans noticed, at times going silent when Oklahoma shot 3s as if they were expecting them to go in. ... Perhaps Hield’s most impressive 3 was a fadeaway with 3:55 left that tied it at 67.

Iowa State: The Cyclones outscored Oklahoma 30-8 in the paint in the first half. But the Sooners buried seven 3s to keep it within 41-35. ... Reserve guard Hallice Cooke, who was suspended for Saturday’s 76-63 win at Kansas State for violating team rules, didn’t play Monday.

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UP NEXT

Oklahoma travels to No. 13 Baylor on Saturday.

Iowa State plays at TCU on Saturday.