USC star QB Caleb Williams played on 'popped' hamstring, refused to be removed from Pac-12 Championship Game | CBS Sports Headlines USC star QB Caleb Williams played on 'popped' hamstring, refused to be removed from Pac-12 Championship Game The Heisman Trophy favorite was obviously slowed by the injury against Utah … Continue reading USC star QB Caleb Williams played on 'popped' hamstring, refused to be removed from Pac-12 Championship Game