(Photo credit: Amber Searls) Marcus Mariota threw three touchdown passes, Kain Medrano returned an interception 50 yards for a score late in the fourth quarter and the Washington Commanders held on to shock the defending champion Seattle Seahawks 33-31 Sunday in Landover, Md. Starting in place of the injured Jayden Daniels (elbow), Mariota was 19-of-31 passing for 183 yards and no interceptions. Terry McLau