AMES, Iowa — Oklahoma's hopes for a share of the Big 12 title are still alive.
The 15th-ranked Sooners will need West Virginia to upset Kansas in Lawrence on Tuesday — and recover from blowing a massive lead at Iowa State.
Georges Niang had 20 of his 23 points in the second half and No. 17 Iowa State rallied from a 21-point deficit to stun Oklahoma 77-70 on Monday night and snap a two-game losing streak.
Monte Morris had 19 points for the Cyclones (21-8, 11-6 Big 12), who maintained their slim shot at a share of the conference title following one of the wilder league games in years.
Oklahoma raced to a 19-point halftime lead. But Iowa State score 22 straight points in just over 5 minutes — all immediately following a technical on Isaiah Cousins for yelling at the Iowa State bench — and outscored the Sooners 59-33 in the second half.
"Obviously not the second half we needed," Oklahoma coach Lon Kruger said. "They hit some 3s and had everything going they wanted ... we didn't do the things we needed to do in the second half."
Buddy Hield had 26 points for the Sooners (20-9, 11-6), who lost for just the second time in 10 games.
Oklahoma had survived scares in its last three games, needing overtime to beat Texas Tech and rallying past Texas and TCU for narrow wins.
The Sooners looked as though they had the Cyclones buried by halftime.
Oklahoma dominated the offensive glass, forced Iowa State to turn it over 10 times in 15 minutes and jumped ahead 37-18. It was a stunning score considering that the Cyclones had won 21 straight home games before last week's loss to Baylor.
But Cousins was whistled following a block by teammate Ryan Spangler with Oklahoma ahead 48-28 — and the Cyclones finally got going.
Their furious run was capped by a 3-pointer from Dustin Hogue that put Iowa State ahead 50-48 with 9:33 left.
The Cyclones kept pushing, and Niang's 3 gave them a 59-52 lead with 6:43 left.
"We broke down and they capitalized off of it. Turnovers, and then they got going in transition," Hield said.
Jameel McKay had 14 points and 12 rebounds for Iowa State, including 10 in the first half to keep the Cyclones within relative striking distance.
Morris, like Niang, took over in the second half scoring all but two of his points.
"Morris off the dribble was tough, creating opportunities for them," Kruger said. "We didn't guard very well off the dribble. They got the confidence. They got the momentum and kept it going."
Iowa State: The Cyclones have won at least 11 Big 12 games in each of the past four seasons. ... Long and McKay staged an impromptu 3-point shooting contest from behind the courtside seats. Long ended it with a swish.
Oklahoma: Cousins had 12 points, Jordan Woodward 10 and Spangler had 9 points, 11 rebounds and that block. ...The Sooners more than doubled up Iowa State by halftime despite shooting just 38 percent. That's because Oklahoma, helped by a 6-1 edge on the offensive glass, had 10 more shots than the Cyclones.
The rally matched the largest second-half comeback in school history (Western Illinois, 1999) and was, according to Iowa State, the largest by a major conference team in 2014-15.
"It just really looked like they were punking us in our own house on Senior Night, and we couldn't let that happen," Niang said.
Iowa State plays at TCU on Saturday.
The Sooners host No. 9 Kansas on Saturday.
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