Naoko Sawamatsu defeated Nathalie Herreman 6-4 6-1 in the Roland Garros round of 128 on clay. The upset overturned the form book — Nathalie Herreman came in leading the head-to-head 1–0, defending last year's round of 128. Naoko Sawamatsu claimed a first win over Nathalie Herreman in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1990-05-28 | Roland Garros | R64 | clay | Nathalie Herreman | 6-1 6-3 |