The 1985 Transamerica Open, also known as the Pacific Coast Championships, was a men's tennis tournament played on indoor carpet courts at the Cow Palace in San Francisco, California in the United States.

The event was part of the 1985 Nabisco Grand Prix circuit.

It was the 97th edition of the tournament and was held from September 23 through September 29, 1985.

Third-seeded Stefan Edberg won the singles title.

[3] Stefan Edberg defeated Johan Kriek 6–4, 6–2 Paul Annacone / Christo van Rensburg defeated Brad Gilbert / Sandy Mayer 3–6, 6–3, 6–4