Stockholm 
Luanda 
Chennai 
WTA Finals 
Villa Maria 
Costa do Sauipe 
Bratislava $114K 
Taipei 
Davis Сup Group I Tennis. Played Costoulas Sofia. Season 2026
Country 
Belgium. Ranking WTA 177.
Belgium. Ranking WTA 177. WTA - Cali | ||||
|---|---|---|---|---|
| 03.11.2026 | First round | Costoulas Sofia — Bassols Ribera Marina | 0:2 (2:6, 0:6) |
|
 WTA - Suzhou | ||||
| 05.10.2026 | First round | Astakhova Darya — Costoulas Sofia (Retired) | 1:0 (6:3) |
|
| WTA - Jingshan | ||||
| 01.10.2026 | Second round | Lansere Sofya — Costoulas Sofia | 2:0 (6:3, 6:4) |
|
| 29.09.2026 | First round | Mladenovic Kristina — Costoulas Sofia | 0:2 (2:6, 5:7) |
|
 WTA - Singapore | ||||
| 22.09.2026 | First round | Prozorova Tatiana — Costoulas Sofia | 2:1 (5:7, 7:6, 6:2) |
|
 WTA - US Open | ||||
| 27.08.2026 | Qualifications - 2nd round | Kalieva Elvina — Costoulas Sofia | 2:1 (3:6, 6:3, 6:4) |
|
| 26.08.2026 | Qualifications - 1st round | Costoulas Sofia — Ruggeri Jennifer | 2:0 (7:5, 6:4) |
|
 WTA - J&S Cup | ||||
| 04.08.2026 | First round | Knutson Gabriela Andrea — Costoulas Sofia | 2:0 (6:2, 6:4) |
|
 WTA - Vancouver | ||||
| 30.07.2026 | Second round | Costoulas Sofia — Inglis Maddison | 0:2 (3:6, 3:6) |
|
| 29.07.2026 | First round | Cabrera Lizette — Costoulas Sofia | 0:2 (2:6, 2:6) |
|
 WTA - ECM Prague Open | ||||
| 19.07.2026 | Qialification final | Costoulas Sofia — Aksu Ayla | 2:0 (7:5, 6:2) |
|
| 18.07.2026 | Qualifications - 1st round | Costoulas Sofia — Hibino Nao | 2:1 (6:7, 7:5, 6:4) |
|
 WTA - | ||||
| 14.07.2026 | First round | Valentova Tereza — Costoulas Sofia | 2:0 (6:1, 6:2) |
|
 WTA - Wimbledon | ||||
| 23.06.2026 | Qualifications - 1st round | Hunter Storm — Costoulas Sofia | 2:0 (7:5, 6:4) |
|
 WTA - | ||||
| 03.06.2026 | Second round | Pieri Tatiana — Costoulas Sofia (Retired) | 1:1 (1:6, 2:3) |
|
 WTA - French Open | ||||
| 21.05.2026 | Qialification final | Guo Hanyu — Costoulas Sofia | 2:0 (6:3, 6:4) |
|
| 20.05.2026 | Qualifications - 2nd round | Costoulas Sofia — Hontama Mai | 2:0 (6:4, 6:3) |
|
| 18.05.2026 | Qualifications - 1st round | Costoulas Sofia — Mrdeza Tereza | 2:0 (6:0, 6:2) |
|
 WTA - Istanbul Cup | ||||
| 05.05.2026 | First round | Ristic Mia — Costoulas Sofia (Retired) | 1:1 (2:6, 5:5) |
|
| WTA - Saint-Malo | ||||
| 01.05.2026 | Quarter-finals | Uchijima Moyuka — Costoulas Sofia | 2:0 (6:4, 6:1) |
|
| 29.04.2026 | Second round | Costoulas Sofia — Jeanjean Leolia | 2:1 (4:6, 7:6, 6:1) |
|
| 28.04.2026 | First round | Costoulas Sofia — Aksu Ayla | 2:0 (7:5, 7:6) |
|
| WTA - Copa Colsanitas Seguros Bolivar | ||||
| 31.03.2026 | First round | Vandewinkel Hanne — Costoulas Sofia | 2:1 (6:3, 2:6, 6:3) |
|
| WTA - | ||||
| 20.02.2026 | Quarter-finals | Ferro Fiona — Costoulas Sofia | 2:0 (6:4, 6:3) |
|
 WTA - Australian Open | ||||
| 13.01.2026 | Qualifications - 1st round | Costoulas Sofia — Tararudee Lanlana | 0:2 (4:6, 3:6) |
|
 WTA - | ||||
| 29.01.2026 | Quarter-finals | Prozorova Tatiana — Costoulas Sofia | 2:1 (4:6, 6:2, 6:4) |
|
| 28.01.2026 | Second round | Costoulas Sofia — Ma Yexin | 2:0 (6:2, 6:4) |
|
 WTA - ASB Classic | ||||
| 09.01.2026 | Quarter-finals | Jovic Iva — Costoulas Sofia | 2:0 (6:2, 7:6) |
|
| 07.01.2026 | Second round | Costoulas Sofia — Quevedo Kaitlin | 2:0 (6:2, 6:0) |
|
| 05.01.2026 | First round | Costoulas Sofia — Osuigwe Whitney | 2:1 (6:4, 3:6, 6:1) |
|
| 04.01.2026 | Qialification final | Costoulas Sofia — Erjavec Veronika | 2:1 (6:3, 4:6, 6:3) |
|