NORMAN, Okla. (AP) — The persistent concern about Oklahoma's defense has returned to the front of the picture of the Sooners' season.

Last year, the Sooners fired their defensive coordinator and eventually posted some of the worst numbers in school history. Oklahoma hired Alex Grinch, and a turnaround appeared to be in the works when the Sooners went six straight games without allowing more than 27 points.

The past two games have seemed more like last year. Oklahoma gave up 48 points against Kansas State, and then 41 against Iowa State.

The 10th-ranked Sooners (8-1, 5-1 Big 12) will learn even...