Sabine Klaschka defeated Nicole Seitenbecher 6-0 4-6 6-3 in the Bielefeld 10K qualifying round on clay. The upset overturned the form book — Nicole Seitenbecher came in leading the head-to-head 2–0. Sabine Klaschka claimed a first win over Nicole Seitenbecher in three meetings, narrowing the head-to-head to 2–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2004-08-23 | Bielefeld 10K | R16 | clay | Nicole Seitenbecher | 6-0 6-1 |
| 2001-10-08 | Cardiff 25K | R32 | hard | Nicole Seitenbecher | 6-2 6-4 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.