Sandra Dopfer defeated Nanne Dahlman 2-6 6-2 6-3 in the US Open round of 64 on hard. The upset overturned the form book — Nanne Dahlman came in leading the head-to-head 1–0. Sandra Dopfer claimed a first win over Nanne Dahlman in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1991-05-27 | Roland Garros | Q16 | clay | Nanne Dahlman | 6-4 4-6 6-0 |