Gregory Girault defeated Sander Groen 6-4 7-6 in the Thailand F1 qualifying round on hard. The upset overturned the form book — Sander Groen came in leading the head-to-head 1–0. Gregory Girault claimed a first win over Sander Groen in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-11-22 | Bangladesh F1 | R32 | hard | Sander Groen | 6-2 6-2 |