Herbert Wiltschnig defeated Konstantin Don Gruber 6-2 6-2 in the Hungary F1 round of 32 on clay. The upset overturned the form book — Konstantin Don Gruber came in leading the head-to-head 3–1. Herbert Wiltschnig narrowed the head-to-head to 3–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2005-07-11 | Austria F5 | R16 | clay | Konstantin Don Gruber | 6-1 7-6(4) |
| 2004-09-06 | Hungary F4 | QF | clay | Konstantin Don Gruber | 6-3 2-6 6-3 |
| 2002-11-04 | Thailand F1 | QF | hard | Konstantin Don Gruber | 4-6 6-3 6-4 |
| 1998-07-20 | Austria F6 | R16 | clay | Herbert Wiltschnig | 6-2 6-4 |