Article Photos: Oklahoma football: Sooner defense's next test is toughest 7/7

OKLAHOMA STATE UNIVERSITY: Oklahoma State's Clint Chelf (10) looks to pass the ball during the college football game between the Oklahoma State University Cowboys (OSU) and the Kansas State University Wildcats (KSU) at Bill Snyder Family Football Stadium on Saturday, Nov. 3, 2012, in Manhattan, Kan. Photo by Chris Landsberger, The Oklahoman