Ella Ionescu defeated Stephanie Halsell 6-4 6-4 in the Coatzacoalcos 10K round of 16 on hard. The upset overturned the form book — Stephanie Halsell came in leading the head-to-head 1–0, but Ella Ionescu had been the form player, winning 3 of their last 4 on hard. Ella Ionescu claimed a first win over Stephanie Halsell in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-05-17 | CD Juarez 10K | QF | hard | Stephanie Halsell | 7-5 6-1 |