FORT WORTH, Texas -- Paul Dawson returned an interception 41 yards for a touchdown, TCU made a huge fourth-and-1 stop with just over 3 minutes left and the No. 25 Horned Frogs remained undefeated with a 37-33 victory over No. 4 Oklahoma yesterday.

Oklahoma (4-1, 1-1 Big 12) had the ball after the teams had three turnovers in a span of four plays -- another interception by Trevor Knight between two fumbles by TCU. On fourth down from the TCU 22, Samaje Perine was stuffed by linebacker Marcus Mallet for no gain. Officials confirmed on a replay review that Perine, who had three TD runs, was stopped short of a first down.

Dawson's big pick and TD return for TCU (4-0, 1-0) came with 14:12 left and made the score 37-31. The Sooners got two points when Jordan Phillips blocked the extra point and Zack Sanchez returned it to the end zone.

TCU improved to 4-0 for the fifth time in the last seven seasons. Trevone Boykin, the dual-threat quarterback flourishing in TCU's new offense, was 20-for-38 for 318 yards with two touchdowns. He added 77 yards rushing.

Boykin fumbled on a keeper in the fourth quarter, but two plays later Chris Hackett had an interception for TCU before B.J. Catalon gave it back on a fumble at the Frogs 46 with six minutes left.

The Sooners picked up one first down on Perine's 6-yard run on third-and-1, then he had a 4-yard gain before Knight had five yards on two more carries to set up that fourth-and-1 play when Perine was stopped. Perine finished with 25 carries for 87 yards, after running for 242 yards in the Sooners' last game two weeks ago at West Virginia.

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