Conchita Martinez defeated Nathalie Tauziat 6-1 6-3 in the US Open round of 64 on hard. The upset overturned the form book — Nathalie Tauziat came in leading the head-to-head 1–0, defending last year's round of 32. Conchita Martinez claimed a first win over Nathalie Tauziat in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1990-08-27 | US Open | R32 | hard | Nathalie Tauziat | 6-2 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.