(Undated)  --  In a move that wasn't wholly unexpected, Oregon tumbled in the second week of rankings, falling five spots from 13 to 18 in the Coaches' Poll.  The Ducks will look to turn things around as they welcome Nevada to Autzen Stadium Saturday.  Oregon lost to then-number 16, now number 13 Auburn Saturday in a play as time expired.  The Beavers will be on the road Saturday as they visit Hawaii.  Oregon State lost big at home to Oklahoma this weekend, 52-36.