| Champ: |  Arthur Ashe |
| Runner: |  Guillermo Vilas |
| Score: | 6–0, 7–6(7–4) |
| Type: | singles doubles |
| Draw: | 64 |
| Seeds: | 16 |
| Main Name: | Pacific Coast Championships |
The 1975 Pacific Coast Open – Singles was an event of the 1975 Pacific Coast Open tennis tournament and was played on outdoor hard courts at the Cow Palace in San Francisco in the United States between September 22 and September 28, 1975. The draw comprised 64 players and 16 of them were seeded. Ross Case was the defending Pacific Coast Open singles champion but did not take part in this edition. Second-seeded Arthur Ashe won the title by defeating first-seeded Guillermo Vilas 6–0, 7–6(7–4) in the final.[1] [2] [3] [4]