Nadine Keller defeated Rachel Zipfel 6-0 6-2 in the W15 Monastir 20 q64 on hard. The result followed the form book — Nadine Keller came in leading the head-to-head 1–0. Nadine Keller extended the head-to-head to 2–0.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2021-05-17 | W15 Monastir 18 | Q32 | hard | Nadine Keller | 6-1 6-1 |