Big 12 Football: 3 teams that will be on upset alert in Week 4

STILLWATER, OK - NOVEMBER 7 : Quarterback Mason Rudolph #2 of the Oklahoma State Cowboys takes a snap against the TCU Horned Frogs November 7, 2015 at Boone Pickens Stadium in Stillwater, Oklahoma. The Cowboys defeated the Horned Frogs 49-29. (Photo by Brett Deering/Getty Images)
STILLWATER, OK - NOVEMBER 7 : Quarterback Mason Rudolph #2 of the Oklahoma State Cowboys takes a snap against the TCU Horned Frogs November 7, 2015 at Boone Pickens Stadium in Stillwater, Oklahoma. The Cowboys defeated the Horned Frogs 49-29. (Photo by Brett Deering/Getty Images) /
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STILLWATER, OK – NOVEMBER 7: Linebacker Chad Whitener #45 of the Oklahoma State Cowboys celebrates stopping the TCU Horned Frogs from scoring November 7, 2015 at Boone Pickens Stadium in Stillwater, Oklahoma. The Cowboys defeated the Horned Frogs 49-29. (Photo by Brett Deering/Getty Images)
STILLWATER, OK – NOVEMBER 7: Linebacker Chad Whitener #45 of the Oklahoma State Cowboys celebrates stopping the TCU Horned Frogs from scoring November 7, 2015 at Boone Pickens Stadium in Stillwater, Oklahoma. The Cowboys defeated the Horned Frogs 49-29. (Photo by Brett Deering/Getty Images) /

The fact that Oklahoma State moved into the top 6 in the AP Poll is a testament to the power of their offense, led by senior quarterback Mason Rudolph. Their passing attack is the best in the country and their running game is underrated.

However, TCU presents the biggest challenge to them yet. The Frogs beat SMU, one of the better Group of Five teams, by a 20-point margin. That came just one week after they dominated an SEC opponent in the Arkansas Razorbacks.

Senior quarterback Kenny Hill is off to one of his better starts in his college career. As long as Hill does not turn the ball over, TCU always has a chance. Not to mention, he has a head coach in Gary Patterson that is one of the best in the Big 12.

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TCU’s defense has to play well for them to upset Oklahoma State. It has been a while since TCU has defeated the Cowboys in Stillwater. They have struggled there in the past but can turn their fortunes around this weekend.