AUSTIN, Texas—Colt McCoy made rare mistakes. The Texas defense got pushed around and the Longhorns watched their big lead and momentum gradually disappear.

Suddenly, the No. 1 team in the country looked vulnerable.

Yet here they are, still unbeaten, and with still more tough games to play.

McCoy passed for 391 yards and two touchdowns Saturday but the Longhorns defense needed to come up with two huge stands in a 28-24 win over No. 7 Oklahoma State after he threw a third-quarter interception and fumbled late in the fourth.

“We’re not going to beat...

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