Oregon fell from 23rd to 24th in the Associated Press Top-25 poll Monday after going 1-1 against Cal and Stanford last weekend.
The Ducks sit at No. 24 despite splitting their home series with the Bay Area schools.
Oregon lost to Cal 48-46 on Thursday, but rebounded with a 77-66 victory over Stanford on Saturday.
Arizona is the only other Pac-12 school ranked in the AP poll at No. 11. The Wildcats were ranked 12th last week.
Cal is the only other team in the AP poll to receiver votes.
Arizona and Oregon are currently tied for first place in the Pac-12 standings at 11-4 in league play. UCLA sits half a game behind at 10-4. Cal sits just one game back at 10-5 in Pac-12 play.
Oregon hosts Oregon State on Thursday at Matthew Knight Arena. Tip is set for 8 p.m. and the game will be broadcast on ESPNU.
In the USA Today Coaches Poll Oregon fell out of the Top-25. They were previously No. 23 in the nation and now have the second most votes for teams outside the Top-25.
Arizona is ranked No. 11.
Cal and UCLA also received votes in the USA Today Coaches Poll.