Midway through last season of Big 12 as we know it

STEPHEN HAWKINS - AP Sports Writer
Oklahoma State's Justin Blackmon runs with the ball during the first half of an NCAA football game against Texas Tech at Jones AT&T Stadium, Saturday, Oct. 16 2010, in Lubbock, Texas. Blackmon had a career-high 207 yards receiving with a touchdown to lead No. 20 Oklahoma State to a 34-17 win over Texas Tech (AP Photo/John A. Bowersmith)
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Oklahoma State's Justin Blackmon runs with the ball during the first half of an NCAA football game against Texas Tech at Jones AT&T Stadium, Saturday, Oct. 16 2010, in Lubbock, Texas. Blackmon had a career-high 207 yards receiving with a touchdown to lead No. 20 Oklahoma State to a 34-17 win over Texas Tech

Oklahoma, Oklahoma State and Missouri are the only teams still undefeated halfway through the final season of the Big 12 as 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 two-game losing streak but still has fewer wins than Baylor (5-2).