By surface
| Surface | Obrien | Richard Trival |
|---|
All meetings (1)
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1981-09-12 | WTA | Los Angeles Sectional | Round of 16 | — | Obrien | 1-6 | 6-0 | 6-2 |
| Surface | Obrien | Richard Trival |
|---|
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 1981-09-12 | WTA | Los Angeles Sectional | Round of 16 | — | Obrien | 1-6 | 6-0 | 6-2 |