 France: W100 Biarritz - Doubles - Main |
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| 1/8-finals | Aksu A./Costoulas S. | Rus A./Schunk N. | WO. | dettagli | 10.06.2025 |
 World: Billie Jean King Cup - Group I - Doubles - Main |
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| | Kempen M./Costoulas S. | Christofi E./Pavlou D. | 2:0 (6:2, 6:3) | dettagli | 08.04.2025 |
| France: W50 Nantes - Doubles - Main |
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| Final | Costoulas S./Gibson T. | Kubka M./Zaar L. | 0:2 (3:6, 2:6) | dettagli | 05.04.2025 |
| Semi-finals | Costoulas S./Gibson T. | Drazic M./Hule P. | 2:0 (7:5, 6:3) | dettagli | 04.04.2025 |
| Quarter-finals | Karamoko N./Perrin C. | Costoulas S./Gibson T. | 0:2 (1:6, 3:6) | dettagli | 03.04.2025 |
| 1/8-finals | Hesse A./Robbe A. | Costoulas S./Gibson T. | 0:2 (4:6, 2:6) | dettagli | 01.04.2025 |
 Italy: W35 Solarino 2 - Doubles - Main |
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| Final | Costoulas S./Hobgarski K. | Hruncakova V./Kuzmova K. | 1:2 (7:64, 4:6, 5:10) | dettagli | 15.03.2025 |
| Semi-finals | Costoulas S./Hobgarski K. | Raggi A./Turini V. | 2:0 (7:64, 6:4) | dettagli | 14.03.2025 |
| Quarter-finals | Grammatikopoulou V./Tsygourova K. | Costoulas S./Hobgarski K. | 0:2 (1:6, 2:6) | dettagli | 13.03.2025 |
| 1/8-finals | Pastikova J./Valdmannova V. | Costoulas S./Hobgarski K. | 0:2 (3:6, 4:6) | dettagli | 12.03.2025 |
 Finland: W35 Helsinki - Doubles - Main |
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| Quarter-finals | Costoulas S./Drazic M. | Bakhmutkina P./Lee C. Y. | 0:2 (5:7, 1:6) | dettagli | 06.03.2025 |
| 1/8-finals | Rajecki A./Stoiber R. A. | Costoulas S./Drazic M. | 0:2 (3:6, 1:6) | dettagli | 04.03.2025 |
 United Kingdom: W35 Manchester - Doubles - Main |
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| Quarter-finals | Arseneault A./Rogers A. S. | Costoulas S./Wong Hong Yi C. | 2:1 (4:6, 6:3, 10:8) | dettagli | 19.02.2025 |
| 1/8-finals | Costoulas S./Wong Hong Yi C. | Davies M./Maloney E. | 2:0 (6:0, 6:3) | dettagli | 18.02.2025 |
Slovenia: W50 Otocec - Singles - Main
Spain: W35 Platja D'Aro - Singles - Main
