By surface
| Surface | Marta Kostyuk | Zeynep Sonmez |
|---|---|---|
| Hard | 3 | 0 |
All meetings (3)
| Date | Tour | Tournament | Round | Surface | Winner | Set 1 | Set 2 | Set 3 | Set 4 | Set 5 |
|---|---|---|---|---|---|---|---|---|---|---|
| 2026-08-31 | WTA | US Open | Round of 64 | Hard | Marta Kostyuk | 7-5 | 6-75 | 6-3 | ||
| 2025-08-25 | WTA | US Open | Round of 64 | Hard | Marta Kostyuk | 7-5 | 6-75 | 6-3 | ||
| 2025-02-09 | WTA | Doha | Round of 64 | Hard | Marta Kostyuk | 6-3 | 6-3 |