(Eugene, OR)  --  Oregon Ducks fans are stunned after their team suffered an upset for the second straight year to the Arizona Wildcats.  The 31-24 win last night in Eugene kept Arizona undefeated on the season, including a two-and-oh record in PAC-12 play.  Quarterback Marcus Mariota passed for 276 yards and two touchdowns in Oregon's first loss of the year.  The Ducks will try to rebound on October 11th when they visit UCLA.