Mayumi Yamamoto defeated Melanie Marois 6-4 7-5 in the Dallas TX 10K round of 16 on hard. The upset overturned the form book — Melanie Marois came in leading the head-to-head 1–0, but Mayumi Yamamoto had been the form player, winning 5 of their last 7 on hard. Mayumi Yamamoto claimed a first win over Melanie Marois in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2003-06-02 | Hilton Head SC 10K | R32 | hard | Melanie Marois | 4-6 6-2 6-2 |