November 2, 2009 – Washington (0–0) #14 (AP), #13 (Coaches); California (0–0) #13 (AP), #12 (Coaches)
November 16, 2009 – Washington (3–0) #14 (AP), #14 (Coaches); California (2–0) #13 (AP), #12 (Coaches)
November 23, 2009 – Washington (4–0) #14 (AP), #14 (Coaches); California (2–2) #23 (Coaches)
November 30, 2009 – Washington (5–0) #12 (AP), #10 (Coaches); California (4–2) #25 (Coaches)
December 7, 2009 – Washington (6–1) #17 (AP), #16 (Coaches)
December 14, 2009 – Washington (6–2) #24 (AP), #21 (Coaches)
December 21, 2009 – Washington (7–2) #22 (AP), #19 (Coaches)
December 28, 2009 – Washington (9–2) #17 (AP), #16 (Coaches)
January 4, 2010 – Washington (10–3) #24 (AP), #22 (Coaches)
Conference games
January 23, 2010 – Five conference teams are tie for second place, and the Oregon schools are last.
January 23, 2010 – Washington has lost all road games, including four conference games.
January 31, 2009 – After playing 9 conference games, California and Arizona are tied for first place with 6 wins and 3 losses, followed by Arizona State and UCLA at third place with a 5–4 conference record.
February 4, 2010 – Four teams tied for first place, Arizona, Arizona State, California and UCLA.
50 former Pac-10 players were listed on the NBA opening day rosters, the average of 5.0 player per conference team tops among all conferences, with 14 former UCLA players are on the teams.
November 26, 2009 – UCLA's loss to Portland 74–47 was the worst defeat during the Ben Howland era.[2]
December
December 1, 2009 – UCLA head coach Ben Howland announced that by mutual agreement, sophomore forward Drew Gordon is no longer a member of the team. Gordon will transfer at the end of the school quarter.
December 6, 2009 – After winning just one in their first four games, the Beavers won three games in a row.
January
January 3, 2010 – USC Athletic Director Mike Garrett announced that the school is forfeiting the 2007–08 season's victories, not participating in any post season tournaments in 2010 and reducing the number of scholarships for two years for violation of NCAA rules.[3]
March
Oregon State basketball coach Craig Robinson has agreed to a two-year contract extension, through the 2015–16 season.
March 17, 2010 – California's Omondi Amoke was suspended for team rules violation going into the NCAA tournament.[4]
March 17, 2010 – Oregon head coach Ernie Kent's contract was terminated effective June 30.[5]
March 19, 2010 – Oregon athletic director Mike Bellotti step down to join ESPN as a football analyst.
June
June 10, 2010 – NCAA to release the report of its investigation of the USC basketball team.