Next Gen ATP Finals 
Tucuman 
WTA Finals 
Brisbane 3 Challenger 
Drummondville 
Kobe 
Montevideo 
Davis Сup Group I Tennis. Played Costoulas Sofia. Season 2025
Country 
Belgium. Ranking WTA 152.
Belgium. Ranking WTA 152. WTA - Rovereto | ||||
|---|---|---|---|---|
| 25.10.2025 | Semi-finals | Costoulas Sofia — Stefanini Lucrezia | 0:2 (3:6, 5:7) |
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| 24.10.2025 | Quarter-finals | Semenistaja Darja — Costoulas Sofia | 1:2 (6:4, 3:6, 3:6) |
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| 22.10.2025 | Second round | Fett Jana — Costoulas Sofia | 1:2 (4:6, 6:3, 3:6) |
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| 21.10.2025 | First round | Zelnickova Radka — Costoulas Sofia | 0:2 (2:6, 4:6) |
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 WTA - Samsun | ||||
| 03.10.2025 | Quarter-finals | Costoulas Sofia — Klimovicova Linda | 0:2 (3:6, 4:6) |
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| 02.10.2025 | Second round | Costoulas Sofia — Gjorcheska Lina | 2:0 (6:1, 6:4) |
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| 01.10.2025 | First round | Costoulas Sofia — Falkowska Weronika | 2:0 (7:6, 6:4) |
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 WTA - US Open | ||||
| 18.08.2025 | Qualifications - 1st round | Volynets Katie — Costoulas Sofia | 2:0 (6:3, 6:4) |
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 WTA - J&S Cup | ||||
| 30.07.2025 | Second round | Costoulas Sofia — Golubic Viktorija | 1:2 (7:5, 3:6, 3:6) |
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| 29.07.2025 | First round | Costoulas Sofia — Kubka Martyna | 2:1 (4:6, 6:3, 6:3) |
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 WTA - Porto | ||||
| 14.07.2025 | First round | Preston Taylah — Costoulas Sofia (Retired) | 1:0 (7:5, 2:1) |
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 WTA - French Open | ||||
| 21.05.2025 | Qualifications - 2nd round | Costoulas Sofia — Radivojevic Lola | 1:2 (1:6, 6:3, 6:7) |
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 ATP - The Dubai Tennis Championships | ||||
| 31.08.2025 | Final | Radivojevic Lola — Costoulas Sofia (Retired) | 1:0 (6:0, 4:1) |
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| 30.08.2025 | Semi-finals | Aksu Ayla — Costoulas Sofia | 1:2 (2:6, 6:1, 3:6) |
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| 28.08.2025 | Second round | Costoulas Sofia — Bains Naiktha | 2:1 (6:3, 5:7, 6:2) |
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