Nikola Martinovic defeated Bostjan Osabnik 6-2 6-3 in the Croatia F2 round of 32 on hard. The upset overturned the form book — Bostjan Osabnik came in leading the head-to-head 1–0. Nikola Martinovic claimed a first win over Bostjan Osabnik in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2003-02-17 | Croatia F2 | R32 | hard | Bostjan Osabnik | 6-1 6-2 |