Susan Cowan defeated Mareze Joubert 6-4 2-6 6-3 in the Warrnambool 1 10K quarter-final on grass. The upset overturned the form book — Mareze Joubert came in leading the head-to-head 1–0. Susan Cowan claimed a first win over Mareze Joubert in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-02-27 | Warrnambool 3 10K | R16 | grass | Mareze Joubert | 6-1 7-6 |