Greta Arn defeated Desislava Topalova 6-0 6-2 in the Horb 10K qualifying round on clay. The upset overturned the form book — Desislava Topalova came in leading the head-to-head 1–0. Greta Arn claimed a first win over Desislava Topalova in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1999-04-05 | Makarska 10K | R16 | clay | Desislava Topalova | 5-7 7-6 6-3 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.