The Cyclones, who led the country and set a school record with 309 3-pointers, missed 11 of their first 12 from behind the arc and fell 14 points behind. But they found the range in the second half and hit six 3-pointers while chalking up their first conference tournament win since 2005.
In the semifinals on Friday, the fifth-seeded Cyclones (22-10) will meet the winner of the Thursday afternoon match between top-seeded Kansas and No. 9 seed Texas Tech.
Ejim led Iowa State with 23 points and 12 rebounds, Clyburn had 17 points, and Georges Niang and Chris Babb each had 10.
Oklahoma (20-10) was led by Romero Osby's 18 points. Cameron Clark had 17, including two free throws that gave the Sooners a 60-48 lead. But then Niang hit a 3-pointer and ignited the 12-0 run in which Clyburn scored seven points, including a long 3-pointer that tied it at 60 at the 4:09 mark and brought several thousand Iowa State fans roaring to their feet.
Clyburn banked home an Iowa State bucket during the 12-0 run, then hit the 3-pointer. Oklahoma's Sam Grooms had two air balls during the run but canned a free throw to tie it the score at 63 before Tyrus McGee's 3-pointer put the Cyclones ahead for good at 66-63.
Another Grooms free throw sliced the led to two points but then Ejim banked home another bucket for Iowa State, and Babb drilled a 3-pointer for a 71-66 lead. (AP/SoonerSports.com)
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