(Undated)  -- Number-seven Stanford and number-19 Oregon will meet in a showdown Saturday in Eugene to open Pac-12 play.  Stanford running back Bryce Love has been cleared to play after missing last week with an undisclosed injury.  Love was the runner up in the Heisman balloting last year.  Oregon State will host Arizona in its conference opener Saturday.  Portland State will face Montana State at Hillsboro Stadium in a Big Sky opener.