Oklahoma QB Baker Mayfield will return for his senior season in 2017, he announced after OU's 38-20 victory over Oklahoma State on Saturday."I'll be here another year for a [Big 12] three-peat," Mayfield said. "The ultimate goal -- why I came here -- is to win a national title."Mayfield, who began his collegiate career at Texas Tech before transferring to Oklahoma after his freshman season, fought for and regained a year of eligibility lost when he had to sit out the entire 2014 season because of conference transfer rules.