Johannes Unterberger defeated Julian Knowle 6-3 3-6 7-5 in the Austria 1 Masters 3 round of 16 on clay. The upset overturned the form book — Julian Knowle came in leading the head-to-head 2–1. Johannes Unterberger narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 1998-11-23 | USA F9 | R32 | hard | Julian Knowle | 6-4 4-6 6-3 |
| 1997-10-18 | Switzerland 2 Masters 4 | R32 | carpet | Julian Knowle | 3-6 6-3 6-4 |
| 1995-10-21 | Switzerland 2 Masters 2 | R32 | carpet | Johannes Unterberger | 7-6 6-7 7-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.