Scott G Winterton,
Utah Utes forward Nakia Arquette (10) tries to put up a shot over Oregon State Beavers forward Deven Hunter (32) as Utah and Oregon State play Sunday, Feb. 22, 2015, in the Huntsman Center in Salt Lake City.

SAN FRANCISCO -- The Pac-12 Conference announced its seedings for the upcoming Pac-12 Tournament, presented by New York Life, with regular season champion Oregon State as the top seed at the annual tournament, this year at Seattle's Key Arena March 5 to 8.

The first four seeds are Oregon State (26-3, 16-2), which won its first ever Pac-12 title behind a 16-2 mark, second-seeded Arizona State (26-4, 15-3), picked to finish sixth or seventh in the preseason, third-seeded Stanford (21-9, 13-5), which has won 10 of the 13 tournament titles and fourth-seeded California (21-8, 13-5), the media's pick for the conference champion. All four teams are ranked within the national top-25 with OSU topping out at No. 7. The first four will receive a first round bye and start play on Friday.

On Thursday, March 4, the first round will take place with seventh-seeded Washington State (16-13, 7-11) taking on tenth-seeded Oregon (13-16, 6-12) at 11:30 a.m. Sixth-seeded UCLA (12-17, 8-10) and 11th-seeded Arizona (10-19, 2-15) will play the afternoon contest at 2 p.m. In the night session, eighth-seeded USC (15-14, 7-11) will play ninth-seeded Colorado (13-16, 6-12) at 6 p.m. USC is the defending Pac-12 Tournament champion. Fifth-seeded Washington (11-7, 22-8) will take on 12th-seeded Utah (9-20, 3-15) at 8:30 p.m.

Friday's games will pit ASU against the winner of WSU and Oregon and Stanford against the winner of UCLA/Arizona at 11:30 a.m. and 2 p.m. In the evening, the Beavers will face the winner of USC and Colorado at 6 p.m., followed by Cal against either Washington or Utah. Game times are 6 p.m. and 8:30 p.m. Stanford has a 35-3 all-time record at the Pac-12 Tournament, having never lost a quarterfinal game.

The semifinals will be at 6 p.m. and 8:30 p.m. on Saturday, March 7, while the championship game will be on ESPN at 6 p.m. on Sunday, March 8. The first three days will be on the Pac-12 Networks.

Tickets start at $110 for an all-session pass, a general admission flex pass starting at $60, single session tickets starting at $20 and groups of 10 or more for $10 per ticket. For ticket information and more tournament information, go to: Pac-12.com/womenstourney

2015 TOURNAMENT SCHEDULE, KEY ARENA, SEATTLE

Thursday, March, 5 Pac-12 Networks

Game No. 1: 11:30 a.m. (7) Washington State vs. (10) Oregon

Game No. 2: 2 p.m. (6) UCLA vs. (11) Arizona

Game No. 3: 6 p.m. (8) USC vs. (9) Colorado

Game No. 4: 8:30 p.m. (5) Washington vs. (12) Utah

Friday, March 6, Pac-12 Networks

Game No. 5: 11:30 a.m. (7) Washington State / (10) Oregon vs. (2) Arizona State

Game No. 6: 2 p.m. (6) UCLA / (11) Arizona vs. (3) Stanford

Game No. 7: 6 p.m. (8) USC / (9) Colorado vs. (1) Oregon State

Game No. 8: 8:30 p.m. (5) Washington / (12) Utah vs. (4) California

Saturday, March 7, Pac-12 Networks

Game 9: 6 p.m. - Game 5 winner vs Game 6 winner

Game 10: 8:30 p.m. - Game 7 winner vs. Game 8 winner

Sunday, March 8, ESPN

Game 11: 6 p.m. - Game 9 winner vs. Game 10 winner

PAST PAC-12 TOURNAMENT CHAMPIONS: ASU-2002, Stanford-2003, 2004, 2005, UCLA-2006, Stanford-2007, 2008, 2009, 2010, 2011, 2012, 2013, USC-2014