STILLWATER, Okla. -- No. 2 Oklahoma State won its final five matches of the day to make a comeback to defeat No. 4 Iowa 18-12 on Sunday in Gallagher-Iba Arena.

"We did what we needed to do," coach John Smith said. "If I had any disappointment, it was with our leads. When we got a lead, we didn't get the critical rides and we let them up. Those types of things put a little damper on our overall performance. Tough classic matches overall, though. One takedown decided most of those matches. Sometimes, that's how it is. You have to stay focused and battle until you score your one takedown."

The Cowboys (8-0) got off to a rough start, losing the first three matches by decision. Senior Jordan Oliver put the first points on the board for OSU when he defeated Michael Kelly 10-4.

Another loss for the Cowboys at 157 pounds gave the Hawkeyes (12-1) a 12-3 advantage in the team score, but Tyler Caldwell, ranked No. 3 in country at 165 pounds, began the Cowboys' return for victory when he picked up a crucial takedown late in the third period, defeating No. 18 Nick Moore 3-2.

In the 174-pound bout, top-ranked Chris Perry defeated No. 4 Mike Evans with a 1:19 riding time advantage to win 4-3.

At 184 pounds, Chris Chionuma provided one of the biggest highlights of the day with a 3-2 upset against No. 10 Ethen Lofthouse, tying the team score at 12.

"It felt really good," Chionuma said. "I needed a breakthrough win. I've been struggling with the top guys. So, coming out with this win is huge for me and the rest of my year."

Blake Rosholt followed suit with a 3-2 win against Nathan Burak, giving the Cowboys the lead for the first time.

Sealing the victory for OSU was third-ranked heavyweight Alan Gelogaev, whose three takedowns and an escape gave him a 7-3 win against No. 7 Bobby Telford.