Mareze Joubert defeated Susan Cowan 6-1 7-6 in the Warrnambool 3 10K round of 16 on grass. The upset overturned the form book — Susan Cowan came in leading the head-to-head 1–0, but Mareze Joubert had been the form player, winning 2 of their last 4 on grass. Mareze Joubert claimed a first win over Susan Cowan in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-02-27 | Warrnambool 1 10K | QF | grass | Susan Cowan | 6-4 2-6 6-3 |