Oklahoma, Oklahoma State and Missouri are the only teams still undefeated halfway through the final season of the Big 12 as we know it.
That unblemished trio will be reduced to two - maybe one - by next weekend. The Sooners, Cowboys and Tigers are all 6-0 overall, and the only teams without a Big 12 loss.
Oklahoma, No. 1 in the BCS standings, goes to Missouri on Saturday. Oklahoma State is home against Nebraska (5-1), the preseason North Division favorite whose chance for a spotless farewell is already done.
Nebraska and Colorado are leaving the Big 12 after this season.
The Cornhuskers are coming off a loss to Texas (4-2), which ended a 2-game losing streak but still has fewer wins than Baylor (5-2).