He briefly showed the form that helped him set a freshman rushing record on the opening drive of the second half. He ran six times for 43 yards and went untouched on an 11-yard touchdown run around the right end to bring the Sooners within 10-7. Garrett Hartley tied the game with a 21-yard field goal five plays after Peterson was hurt.

But after that, the Sooners’ offense went flat again.

Thompson threw an interception to end one drive and Lendy Holmes was unable to handle a high fourth-down pass on another. Thompson finished 11-for-26 for 109 yards.

“We just didn’t have good execution,” Thompson said. “TCU did a good job of putting a stop to us, and we couldn’t execute as well as we needed to.”

TCU was finally able to overcome poor field position on its fourth drive thanks to Gunn’s pinpoint passing. Gunn was 5-for-6 on the drive and capped it by eluding the grasp of a diving Dusty Dvoracek and hitting Derek Moore for a 16-yard TD pass.

After a three-and-out by the Sooners, Gunn hit running back Lonta Hobbs for a 41-yard gain down the left sideline to set up a 25-yard field goal by Peter LoCoco.

Gunn, a senior, set a TCU record by opening his career with 10 straight wins, but injuries sidelined him after the Frogs’ third game last season.

He was slow to get up after defensive end John Williams planted him on an option play late in the first half, but was able to walk off the field without help. He returned two plays later.

College football Two-man race with Tebow, McFadden

“I said going into the ballgame that I thought there was a little bit of an advantage in having a senior quarterback,” Patterson said. “He gave me a scare .. and I told him to never do it again.”

Stoops, meanwhile, questioned his team’s toughness and attitude.

“They came in here and beat us,” he said, “and that is it.”