Level, 2 wins each over 4 singles meetings since 2021. Last meeting on 21/07/2025 at Mubadala Citi DC Open - Washington.
| Date | Tournament | Round | Surface | Winner | Score |
|---|---|---|---|---|---|
| 21/07/2025 | Mubadala Citi DC Open - Washington | Round 1 | hard | Raducanu | 6-7(4) 4-6 |
| 25/04/2025 | Mutua Madrid Open - Madrid | Round 2 | clay | Kostyuk | 4-6 6-2 2-6 |
| 01/05/2022 | Mutua Madrid Open - Madrid | Round 2 | clay | Raducanu | 6-2 6-1 |
| 29/10/2021 | Transylvania Open - Cluj-Napoca | Quarter-final | indoor hard | Kostyuk | 2-6 1-6 |
| hard | Kostyuk 0 - 1 Raducanu |
| clay | Kostyuk 1 - 1 Raducanu |
| indoor hard | Kostyuk 1 - 0 Raducanu |
| 2025 | Kostyuk 1 - 1 Raducanu |
| 2022 | Kostyuk 0 - 1 Raducanu |
| 2021 | Kostyuk 1 - 0 Raducanu |
171 wins, 107 losses since 2021 (61.5%).
Last matches: V V V D V
108 wins, 74 losses since 2021 (59.3%).
Last matches: D V V V V
Level, 2 wins each over 4 singles meetings since 2021.
On 21/07/2025, at Mubadala Citi DC Open - Washington (Round 1): Emma Raducanu won 6-7(4) 4-6.