Article Photos: Oklahoma football: Sooners' defense shines in first half 69/99

Oklahoma's Eric Striker (19) is called for a face mask violation as he brings down TCU's Brandon Carter (3) during the second half of a college football game between the University of Oklahoma Sooners (OU) and the TCU Horned Frogs at Gaylord Family-Oklahoma Memorial Stadium in Norman, Okla., on Saturday, Oct. 5, 2013. Photo by Steve Sisney, The Oklahoman