Natalia Fehr defeated Janika Kusy Alzugaray 6-4 6-4 in the W15 Heraklion 5 q64 on clay. The upset overturned the form book — Janika Kusy Alzugaray came in leading the head-to-head 1–0. Natalia Fehr claimed a first win over Janika Kusy Alzugaray in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2021-05-22 | W15 Sibenik 2 | Q64 | clay | Janika Kusy Alzugaray | 6-4 6-7(3) 10-7 |
Averages over each player's completed matches in the selected window. ATP, WTA & Challenger.