STILLWATER, Okla.—Oklahoma State coach Mike Gundy could sure use one of those trinkets out of a science-fiction movie that would flash a bright light and erase his memory heading into Saturday’s game against No. 1 Texas.

No team has created more anguish for the seventh-ranked Cowboys (7-0, 3-0 Big 12) in recent years than the Longhorns. It’s not just that Texas has 10 straight wins in the series. It’s the fashion in which those victories have come.

Four of the past five years, the Longhorns have rallied from deficits to rip out the Cowboys’ hearts. None was more wrenchi...

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