Bostjan Osabnik defeated Marko Tkalec 6-2 7-5 in the Croatia F6 qualifying round on clay. The upset overturned the form book — Marko Tkalec came in leading the head-to-head 3–0. Bostjan Osabnik claimed a first win over Marko Tkalec in four meetings, narrowing the head-to-head to 3–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-05-10 | Hungary F2 | QF | clay | Marko Tkalec | 3-6 7-6(2) 6-2 |
| 2003-09-22 | Croatia F6 | QF | hard | Marko Tkalec | 6-2 6-0 |
| 2000-08-14 | Lithuania F1 | SF | clay | Marko Tkalec | 6-2 6-3 |