Conchita Martinez defeated Kimberly Po Messerli 6-1 6-4 in the US Open round of 64 on hard. The result followed the form book — Conchita Martinez came in leading the head-to-head 1–0, defending last year's round of 32. Conchita Martinez extended the head-to-head to 2–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-08-03 | San Diego | R32 | hard | Conchita Martinez | 6-4 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.