(Tucson , AZ)  --  Tres Tinkle put up 16 points but it wasn't nearly enough as Oregon State fell to number-15 Arizona 80-63 Saturday at the McKale Center.  Olaf Schaftenaar added 14 points as the only other player to score in double-figures for the Beavers.  Oregon State lost five of its last six games and sits at 12-and-8 overall.  The team will look to get back on track Thursday against Utah at home.