Mariaan De Swardt defeated Dominique Monami 1-6 6-2 7-6 in the US Open round of 128 on hard. The upset overturned the form book — Dominique Monami came in leading the head-to-head 1–0, defending last year's round of 64. Mariaan De Swardt claimed a first win over Dominique Monami in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-06-08 | Birmingham | R16 | grass | Dominique Monami | 7-5 6-3 |