(Undated)  --  Oregon State will host in-state rival Oregon in a three-game Pac-12 series beginning today in Corvallis. The Beavers are 26-and-6 overall and 7-and-5 in Pac-12 play.  The Ducks are 19-and-15 and 6-and-9 in the conference.  Portland fell 8-7 yesterday at UNLV.  The Pilots will play a three-game weekend WCC series against Loyola Marymount, beginning tomorrow night in Los Angeles.