David Thurner defeated David Klier 7-5 6-1 in the Switzerland F3 round of 32 on carpet. The upset overturned the form book — David Klier came in leading the head-to-head 1–0. David Thurner claimed a first win over David Klier in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2006-09-04 | Germany F15 | R32 | clay | David Klier | 3-6 6-3 6-2 |