| Champ: |  Arthur Ashe |
| Runner: | Roscoe Tanner |
| Score: | 3–6, 7–5, 6–3 |
| Draw: | 64 |
| Seeds: | 16 |
| Type: | singles doubles |
| Main Name: | Los Angeles Open (tennis)Los Angeles Open |
The 1975 Pacific Southwest Open – Singles was an event of the 1975 Pacific Southwest Open tennis tournament and was played on indoor carpet courts at the Pauley Pavilion in Los Angeles, in the United States, between September 16 and September 22, 1975. The draw comprised 64 players of which 16 were seeded. Jimmy Connors was the defending Pacific Southwest Open singles champion but did not compete in this edition. First-seeded Arthur Ashe won the title by defeating second-seeded Roscoe Tanner in the final, 3–6, 7–5, 6–3.[1] [2] [3] [4]