When Oklahoma faces Texas in October, the likelihood is that the winner of this matchup will be at the top of the Big 12 Standings.According to ESPN’s Football Power Index, Oklahomas has a 70.8 percent chance of defeating Texas.Texas would need to defeat Oklahoma and basically remain perfect through the rest of the season to keep its playoff hopes alive. ESPN analyst Kirk Herbstreit isn’t ready to count Tom Herman’s squad out just yet.Kickoff for this showdown will be at 12 p.m. ET from the Cotton Bowl. ARLINGTON, TEXAS – DECEMBER 01: Sam Ehlinger #11 of the Texas Longhorns throws against the Oklahoma Sooners in the first quarter at AT&T Stadium on December 01, 2018 in Arlington, Texas. (Photo by Ronald Martinez/Getty Images)Once again, the best Big 12 matchup to circle on the calendar is the Red River Showdown between Texas and Oklahoma. Both programs could have their postseason dreams determined in that eventual game.The Sooners have looked outstanding in their first two games of the season. Jalen Hurts has clearly grasped Lincoln Riley’s offense, and it’s possible the former Alabama quarterback wins the Heisman Trophy.As for the Longhorns, they’re coming off a crushing loss to the LSU Tigers. Sam Ehlinger and the offense put up a strong fight against the SEC powerhouse, but they fell short in the shootout.Starting off the season with a 1-1 record for Texas isn’t ideal by any means. On the flip side, the team has plenty of chances to boost its resume during conference play.