The 1970 Pacific Coast International Open was a tennis tournament played on outdoor hard courts at the Berkeley Tennis Club in Berkeley, California in the United States and was part of the Grand Prix tennis circuit. It was the 82nd edition of the tournament and ran from September 28 through October 4, 1970. Arthur Ashe won the singles title.
Arthur Ashe defeated Cliff Richey 6–4, 6–2, 6–4
Bob Lutz / Stan Smith defeated Roy Barth / Tom Gorman 6–2, 7–5, 4–6, 6–2