Dusan Mihailovic defeated Christian Groh 4-6 7-6 6-1 in the Poland F6 round of 16 on clay. The upset overturned the form book — Christian Groh came in leading the head-to-head 1–0, but Dusan Mihailovic had been the form player, winning 2 of their last 7 on clay. Dusan Mihailovic claimed a first win over Christian Groh in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2003-05-05 | Bulgaria 1 2 | R32 | clay | Christian Groh | 7-6(6) 6-7(4) 7-5 |