Jan Mertl defeated Bostjan Osabnik 6-1 6-4 in the Slovenia F2 round of 32 on clay. The upset overturned the form book — Bostjan Osabnik came in leading the head-to-head 1–0. Jan Mertl claimed a first win over Bostjan Osabnik in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-10-25 | Czech Rep F4 | QF | hard | Bostjan Osabnik | 5-7 7-6(8) 6-2 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.