Nicole Rencken defeated Joanne Moore 6-4 6-3 in the Houston TX 10K round of 16 on hard. The upset overturned the form book — Joanne Moore came in leading the head-to-head 1–0, but Nicole Rencken had been the form player, winning 5 of their last 9 on hard. Nicole Rencken claimed a first win over Joanne Moore in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-11-08 | San Salvador 10K | QF | clay | Joanne Moore | 6-2 7-6 |