Article Photos: Oklahoma football: Blake Bell approaches every day like he's the starter — but so does Trevor Knight 10/62

Running backs Damien Williams and  David Smith sign autographs during fan appreciation day for the University of Oklahoma Sooner (OU) football team at Gaylord Family-Oklahoma Memorial Stadium in Norman, Okla., on Saturday, Aug. 3, 2013. Photo by Steve Sisney, The Oklahoman