Zbynek Mlynarik defeated Bastian Gronefeld 7-5 6-0 in the Netherlands F1 round of 16 on clay. The upset overturned the form book — Bastian Gronefeld came in leading the head-to-head 1–0. Zbynek Mlynarik claimed a first win over Bastian Gronefeld in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2003-06-16 | Germany F7 | R16 | clay | Bastian Gronefeld | 6-1 |