Marc Sieber defeated David Klier 7-6 6-4 in the Germany F6 round of 32 on clay. Marc Sieber extended the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2009-01-05 | Germany F1 | R16 | carpet | David Klier | 7-6(3) 6-7(4) 7-6(1) |
| 2007-07-02 | Austria F4 | R16 | clay | Marc Sieber | 6-5 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.