Rachel Mcquillan defeated Conchita Martinez 6-2 7-5 in the US Open round of 32 on hard. The upset overturned the form book — Conchita Martinez came in leading the head-to-head 1–0. Rachel Mcquillan claimed a first win over Conchita Martinez in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-01-11 | Sydney | R32 | hard | Conchita Martinez | 6-0 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.