Kateryna Diatlova defeated Marianne Argyrokastriti 6-2 4-6 6-3 in the W15 Heraklion 4 semi-final on hard. The upset overturned the form book — Marianne Argyrokastriti came in leading the head-to-head 1–0. Kateryna Diatlova claimed a first win over Marianne Argyrokastriti in two meetings, narrowing the head-to-head to 1–1.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 2025-09-10 | W15 Heraklion 5 | R32 | hard | Marianne Argyrokastriti | 6-2 3-0 |