Konstantin Don Gruber defeated Herbert Wiltschnig 6-3 2-6 6-3 in the Hungary F4 qualifying round on clay. Konstantin Don Gruber extended 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) |
| 2005-04-25 | Hungary F1 | R32 | clay | Herbert Wiltschnig | 6-2 6-2 |
| 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 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.