| ITF - Verbier W25 | 08/23 08:55 | 25 | [299] Sofia Costoulas v Berta Bonardi [419] | 7-5,5-7,3-6 | |
| ITF - Bistrita W25 | 08/18 11:20 | 27 | [299] Sofia Costoulas v Ilinca D Amariei [438] | 6-7,3-6 | |
| ITF - Bistrita W25 | 08/17 13:05 | 26 | Sofia Costoulas v Jessica Pieri | 7-6,6-4 | |
| ITF - Bistrita W25 | 08/15 12:15 | 25 | Sofia Costoulas v Briana Szabo | 6-3,6-1 | |
| ITF - Hechingen W60 | 08/03 12:05 | 26 | [141] Brenda Fruhvirtova v Sofia Costoulas [307] | 6-3,6-2 | |
| ITF - Hechingen W60 | 08/01 16:45 | 25 | Sofia Costoulas v Stephanie Wagner | 6-2,6-3 | |
| ITF - Porto W40 | 07/19 18:35 | 25 | Sofia Costoulas v Daria Khomutsianskaya | 3-6,6-7 | |
| ITF - Corroios-Seixal W25 | 07/12 10:00 | 25 | Aliona Falei v Sofia Costoulas | 6-4,2-6,6-3 | |
| ITF - Tainan W25 | 06/20 03:40 | 25 | [285] Sofia Costoulas v Yi Tsen Cho [414] | 3-6,4-6 | |
| ITF - Tainan W25 | 06/15 04:35 | 26 | [476] Ayano Shimizu v Sofia Costoulas [281] | 6-4,3-6,7-6 | |
| ITF - Tainan W25 | 06/14 04:10 | 25 | Samantha Imbo Nloga v Sofia Costoulas | 2-6,1-6 | |
| ITF - Troisdorf W25 | 05/31 12:20 | 25 | Sofia Costoulas v Gina M Dittmann | 3-6,6-3,5-7 | |
| ITF - Grado W60 | 05/24 11:25 | 26 | [325] Sofia Costoulas v Hailey Baptiste [244] | 3-6,2-6 | |
| ITF - Grado W60 | 05/23 07:30 | 25 | [338] Anna Siskova v Sofia Costoulas [325] | 0-6,1-6 | |
| ITF - Feld Am See W25 | 05/20 10:05 | 29 | Lara Salden v Sofia Costoulas | 3-6,1-6 | |
| ITF - Feld Am See W25 | 05/19 09:00 | 28 | [326] Sofia Costoulas v Elvina Kalieva [243] | 6-2,6-3 | |
| ITF - Feld Am See W25 | 05/18 08:00 | 27 | [345] Maja Chwalińska v Sofia Costoulas [326] | 4-6,4-6 | |
| ITF - Feld Am See W25 | 05/17 11:00 | 26 | [367] Kayla Cross v Sofia Costoulas [326] | 7-5,5-7,3-6 | |
| ITF - Feld Am See W25 | 05/17 07:30 | 25 | Arabella Koller v Sofia Costoulas | 6-4,4-6,1-6 | |
| ITF - Osijek W25 | 04/27 10:40 | 26 | [334] Sofia Costoulas v Tena Lukas [233] | 4-6,1-6 | |
| ITF - Osijek W25 | 04/26 09:30 | 25 | [334] Sofia Costoulas v Julia Avdeeva [465] | 2-6,6-3,7-6 | |
| ITF - Bellinzona W60 | 04/17 12:35 | 24 | [342] Andrea Lazaro Garcia v Sofia Costoulas [358] | 7-5,6-3 | |
| ITF - Santa Margherita W25 | 04/15 11:50 | 28 | [411] Andreea Prisacariu v Sofia Costoulas [360] | 6-1,1-6,6-2 | |
| ITF - Santa Margherita W25 | 04/14 11:10 | 27 | Sofia Costoulas v Federica Bilardo | 6-4,6-4 | |
| ITF - Santa Margherita W25 | 04/13 08:30 | 26 | [301] Matilde Paoletti v Sofia Costoulas [360] | 1-6,3-6 | |
| ITF - Santa Margherita W25 | 04/11 14:15 | 25 | [360] Sofia Costoulas v Ikumi Yamazaki [426] | 7-6,6-2 | |
| ITF - Pretoria W60 | 03/16 08:00 | 26 | [192] Ipek Oz v Sofia Costoulas [347] | 7-6,6-1 | |
| ITF - Pretoria W60 | 03/14 09:25 | 25 | [347] Sofia Costoulas v Lucie Nguyen Tan [378] | 6-3,6-1 | |
| ITF - Pretoria W25 | 03/11 08:00 | 28 | [347] Sofia Costoulas v Emina Bektas [325] | 3-6,6-4,6-7 | |
| ITF - Pretoria W25 | 03/10 08:00 | 27 | [338] Jenny Duerst v Sofia Costoulas [347] | 4-6,3-6 |
Sofia Costoulas (ur. 2 kwietnia 2005) – belgijska tenisistka.