Philipp Piyamongkol defeated Philipp Marx 6-3 2-6 6-4 in the Germany F1 round of 32 on carpet. The upset overturned the form book — Philipp Marx came in leading the head-to-head 1–0, but Philipp Piyamongkol had been the form player, winning 3 of their last 4 on carpet. Philipp Piyamongkol claimed a first win over Philipp Marx in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-10-04 | Germany 1 Satellite 2 | R32 | carpet | Philipp Marx | 7-6(6) 6-2 |