Oklahoma defensive tackle Casey Walker answers a question during an NCAA college football news conference in Norman, Okla., Monday, Nov. 12, 2012. “We have to stop the run to be a good defense,” Walker said. (AP Photo/Sue Ogrocki)

Oklahoma head coach Bob Stoops gestures as he answers a question during an NCAA college football news conference in Norman, Okla., Monday, Nov. 12, 2012. Oklahoma is scheduled to play West Virginia on Saturday. (AP Photo/Sue Ogrocki)