Oliver was named Most Outstanding Wrestler. He improved to 17-0 this season while also notching career win No. 100.
Morrison beat two higher-ranked wrestlers to take the 133-pound crown. He defeated No. 6-ranked Nathan McCormick of Missouri 3-1 in the semifinals, and then trimmed No. 5 Chris Dardanes of Minnesota 3-2.
Top-ranked Perry escaped with the 174 championship, edging Logan Storley of Minnesota 7-6 with riding time.
No. 2-ranked Oklahoma State return to Gallagher-Iba Arena at 2 p.m. Sunday, Jan. 13, against the Iowa Hawkeyes.