Baker Mayfield leaves game after second-quarter hit

— -- NORMAN, Okla. -- Quarterback Baker Mayfield did not start the second half of Oklahoma's game with TCU after suffering an undisclosed injury.

The Heisman Trophy hopeful took a shot in the second quarter from TCU linebacker Ty Summers, who was ejected for targeting. Mayfield appeared shaken up after the hit but didn't immediately come out and even tossed a 36-yard touchdown pass to Dede Westbrook.

Mayfield was replaced by Trevor Knight, who was Oklahoma's first-team quarterback last season.

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Mayfield completed 9 of 20 passes in the first half for 127 yards and two touchdowns.

The seventh-ranked Sooners held a 23-7 lead over No. 18 TCU at halftime.