 Japan: W50 Kofu - Doubles - Main |
|---|
| 1/8-finals | Costoulas S./Li Y. | Ito A./Kobori M. | 0:2 (4:6, 2:6) | details | 27.03.2024 |
| Japan: W15 Hinode - Doubles - Main |
|---|
| 1/8-finals | Costoulas S./Malygina E. | Kim D./Mushika Mio | 0:2 (3:6, 0:6) | details | 19.03.2024 |
 Dominican Republic: W35 Santo Domingo - Doubles - Main |
|---|
| Semi-finals | Costoulas S./Gao X. | Corley C./Corley I. | 1:2 (5:7, 7:5, 6:10) | details | 08.03.2024 |
| Quarter-finals | Rodriguez V./Sanchez A. S. | Costoulas S./Gao X. | 0:2 (4:6, 3:6) | details | 07.03.2024 |
| 1/8-finals | Jokic K./Portillo Ramirez M. J. | Costoulas S./Gao X. | 1:2 (6:2, 0:6, 9:11) | details | 05.03.2024 |
 South Africa: W50 Pretoria - Doubles - Main |
|---|
| Final | Glushko L./Knutson G. | Costoulas S./Vandewinkel H. | 2:0 (7:65, 7:64) | details | 24.02.2024 |
| Semi-finals | Costoulas S./Vandewinkel H. | Saigo R./Saigo Y. | 2:0 (6:4, 6:1) | details | 23.02.2024 |
| Quarter-finals | Corley P./Daniel J. | Costoulas S./Vandewinkel H. | 0:2 (4:6, 0:6) | details | 22.02.2024 |
| 1/8-finals | Berecoechea N./Kruger I. | Costoulas S./Vandewinkel H. | 0:2 (4:6, 63:7) | details | 21.02.2024 |
 United Kingdom: W50 Roehampton - Doubles - Main |
|---|
| Quarter-finals | Costoulas S./Salden L. | Christie F./Murray S. | 1:2 (7:63, 4:6, 6:10) | details | 15.02.2024 |
| 1/8-finals | Black B./Blackford E. | Costoulas S./Salden L. | 0:2 (3:6, 1:6) | details | 13.02.2024 |
 USA: W75 Rome, GA - Doubles - Main |
|---|
| 1/8-finals | Haverlag I./Rogers A. S. | Bayerlova M./Costoulas S. | 2:0 (6:4, 6:3) | details | 30.01.2024 |
| USA: W35 Naples, FL 2 - Doubles - Main |
|---|
| Semi-finals | Benoit M./Costoulas S. | Kalieva E./Kozyreva M. | 0:2 (5:7, 5:7) | details | 19.01.2024 |
| Quarter-finals | McAdoo R./Rogers A. S. | Benoit M./Costoulas S. | 0:2 (4:6, 3:6) | details | 18.01.2024 |
| 1/8-finals | Benoit M./Costoulas S. | Chang H./Lee G. | 2:0 (7:65, 6:4) | details | 16.01.2024 |
 Cyprus: W25 Limassol 2 - Doubles - Main |
|---|
| Semi-finals | Costoulas S./Laskutova K. | Dunne K./Kung L. | 1:2 (7:64, 2:6, 10:12) | details | 01.12.2023 |
| Quarter-finals | Costoulas S./Laskutova K. | Matoula M./Siopacha M. | 2:0 (6:4, 6:3) | details | 30.11.2023 |
| Cyprus: W25 Limassol - Doubles - Main |
|---|
| 1/8-finals | Costoulas S./Sakellaridi S. | Grechkina A./Stankovic A. | 1:2 (62:7, 7:64, 8:10) | details | 22.11.2023 |
World: Billie Jean King Cup - World Group - Singles - Qualification