The Arizona Wildcats still have a chance to win the Pac-12, but they would not only have to sweep at home (hardly impossible), it would require a lot of help from Utah and Oregon somehow going 0-3 (who have won their last nine games combined). Arizona is two games back of Oregon and has only a very remote chance to tie for first and pretty much needs everyone ahead of them to lose out.
So that leaves three.
Oregon Ducks: Oregon is in the driver's seat for at least a share of the Pac-12 title.