Nina Duebbers defeated Sabine Klaschka 7-5 2-6 6-1 in the Vaihingen 25K round of 32 on clay. The upset overturned the form book — Sabine Klaschka came in leading the head-to-head 2–1. Nina Duebbers narrowed the head-to-head to 2–2.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-06-28 | Vaihingen 25K | R32 | clay | Sabine Klaschka | 6-0 6-1 |
| 2000-10-30 | Hull 25K | R32 | hard | Nina Duebbers | 4-0 1-4 5-3 4-1 |
| 1999-08-23 | Hechingen 10K | SF | clay | Sabine Klaschka | 4-6 7-5 6-1 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.