Hill opened the second half with three consecutive incompletions. On the first play after the punt, Mayfield hit Mykel Jones for a 55-yard catch-and-run score.
On fourth-and-1 from the Oklahoma 41 on the next drive, Hill bootlegged to the right side. Defensive end Ogbonnia Okoronkwo chased him toward the sideline before Parnell Motley delivered the crushing blow that kept T.C.U.’s quarterback from getting a first down.
Two plays later, Marquise Brown made an impressive over-the-shoulder grab for a 52-yard touchdown and a 38-17 lead.
The Horned Frogs had allowed only six points (two field goals) combined after halftime in their last seven games. Even Oklahoma was scoreless in the second half of its 38-20 home win over T.C.U. three weeks ago. The 41 points are the most T.C.U. has allowed this season.
The Horned Frogs could still make it into one of the New Year’s Six bowl games, and if not likely will be the Big 12 representative in the Alamo Bowl.
The Sooners clinched their third straight Big 12 title, all since Mayfield, a former Texas Tech transfer, took over as the starting quarterback. Their 11th Big 12 title overall was the first without Bob Stoops, the coach for their last national title in 2000 who resigned unexpectedly last summer. Lincoln Riley, at 34 the youngest head coach in the Football Bowl Subdivision, is only the fifth coach in F.B.S. history with no previous head coaching experience at a four-year college to win at least 12 games in his debut season.
The Sooners must now wait to find out who they will play and in which national semifinal game, the Rose Bowl or Sugar Bowl.