Article Photos: Oklahoma football: Sooners' defense shines in first half 50/99

Oklahoma's Zack Sanchez (15) breaks up a pass intended for TCU's Brandon Carter (3) during 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. Oklahoma won 20-17. Photo by Bryan Terry, The Oklahoman