 The predecessor conference of the Pacific-10, the Pacific Coast Conference began playing basketball in the 1915-16 season. The PCC was split into North and South Divisions for basketball beginning with the 1922-23 season. The winners of the two divisions would play a best of three series of games to determine the PCC basketball champion. If two division teams tied, they would have a one game playoff to produce the division representative. Starting with the first NCAA Men's Basketball Championship in 1939, the winner of the PCC divisional playoff was given the automatic berth in the NCAA tournament. Oregon, the 1939 PCC champion, won the championship game in the 1939 NCAA Men's Division I Basketball Tournament. The last divisional playoff was in the 1954-55 season. After that, there was no divisional play and all teams played each other in a round robin competition. From the 1955-56 season through the 1985-86 season, the regular season conference champion was awarded the NCAA tournament berth from the PCC, later AAWU, Pac-8 and Pac-10. Beginning with the 1975 NCAA Men's Division I Basketball Tournament, the Pac-10 would usually place at least one other at-large team in the tournament. Although, since the run by UCLA that ended in the 1970s, the PAC-10 would struggle to get out of the early rounds of the NCAA tournament. By the 1985-86 season, the Pac-10 was one of three remaining conferences that gave their automatic NCAA tournament bid to the regular season round-robin champion. The other two conferences were the Ivy League and the Big Ten Conference. The modern tournament format began in 1987. The first incarnation of the tournament ran from 1987 to 1990, hosted at different school sites. UCLA was awarded the inaugural tournament, which was won by the Bruins. The Arizona Wildcats would take the next three. It was dropped after 1990 upon opposition from coaches, poor revenue, and poor attendance. The Pac-10 went back to having the regular season conference champion get awarded the automatic NCAA tournament bid. During that time Arizona and UCLA both won NCAA championships. In 1998, the Big Ten began to hold a conference tournament, leaving the Pac-10 and Ivy League the lone conferences without post season tournaments. The tournament was restarted by a 8-2 vote of the athletic directors of the conference in 2000 after determining that a tournament would help increase exposure of the conference and help the seeding of the schools in the NCAA tournament. Stanford University and the University of Arizona opposed the tournament, while UCLA's and USC's votes, considered the deciding votes, were swayed by permanently hosting the tournament at Staples Center. Los Angeles is the second largest media market in the United States. The championship game has been broadcast nationally by the CBS television market. | 
