QB Marcus Mariota : He struggled in the first four weeks of the season .
QB has cut down on killer turnovers , and since Week 5 QB 's second in the NFL with a 117.7 passer rating thanks largely to 21 touchdown passes and only three interceptions .
QB Marcus Mariota : He struggled in the first four weeks of the season , but he has cut down on killer turnovers , and since Week 5 he 's second in the NFL with a 117.7 passer rating thanks largely to 21 touchdown passes and only three interceptions .