NORMAN, Okla. (KFOR) — Country music star Blake Shelton has been selected as the guest picker for ESPN College GameDay during their upcoming visit to Norman on Saturday. College GameDay is scheduled to air on ESPN starting at 8 a.m. on Saturday morning. The No. 15 ranked Sooners are set to take on the No. 6 Tennessee Volunteers in Norman at 6:30 p.m. on Saturday.