(Undated)  --  Oregon State edged Nevada 3-2 in extra innings yesterday in Corvallis.  After the Beavers tied the game in the bottom of the ninth the Wolfpack center fielder dropped a fly ball in the 11th to allow the winning run to score.  OSU improved to 22-and-4.  The Beavers and Wolfpack close out their two-game series tonight.  The Ducks topped San Francisco 5-2 yesterday to improve to 16-and-11.  Oregon returns to Pac-12 play on Friday when they start a three-game home series with Washington State.