(Corvallis, OR)  --  Oregon State opened up a 15-point lead by halftime as it rolled the Ducks, 70-57 last night at Gill Coliseum.  In the Pac-12 opener for both teams, the Beavers prevailed behind 19 points for Tres Tinkle.  The 10-and-2 Beavers host Stanford on Wednesday.  Chris Boucher led the Ducks with 16 points as they fell to 11-and-3.  They'll host Cal on Wednesday.