The Cyclones trailed by as many as 21 in the first half before rallying to a 46-45 lead on Tre Jackson’s 3-pointer with 11:29 remaining. The Sooners then responded with a 16-4 spurt to grab the lead for good.
De’Vion Harmon and Umoja Gibson each made a 3-pointer before Reaves capped the decisive stretch with a free throw, making it 61-50 with 4:38 left.
“We really just locked back in,” Reaves said. “We let them get some momentum and take the lead, and that’s something we’ve got to work on.”
Reaves helped seal the win with two free throws and a long 3-pointer in the final 1:34. He finished 8 for 10 from the line.
Gibson and Harmon each had 10 points for the Sooners. Rasir Bolton led Iowa State with 14 points and six assists.
“It was a good response,” Oklahoma coach Lon Kruger said of the Sooners regaining control. “The guys I thought played with poise.”
Oklahoma jumped ahead early, going on a 12-0 run and building a 14-2 lead. Iowa State missed seven consecutive shots during the Sooners’ scoring spree and was 2-for-11 entering the second media timeout.
A 3-pointer from Jalen Hill and a dunk by Alondes Williams helped Oklahoma extend its margin to 26-7. The Cyclones used a 7-0 run to keep the game competitive, but still trailed 41-25 at halftime.