| ITF W25 Tainan | 06/15 04:35 | 26 | [476] Ayano Shimizu v Sofia Costoulas [281] | 6-4,3-6,7-6 | |
| ITF W25 Tainan | 06/14 04:10 | 25 | Samantha Imbo Nloga v Sofia Costoulas | 2-6,1-6 | |
| ITF W25 Troisdorf | 05/31 12:20 | 25 | Sofia Costoulas v Gina M Dittmann | 3-6,6-3,5-7 | |
| ITF W60 Grado | 05/24 11:25 | 26 | [325] Sofia Costoulas v Hailey Baptiste [244] | 3-6,2-6 | |
| ITF W60 Grado | 05/23 07:30 | 25 | [338] Anna Siskova v Sofia Costoulas [325] | 0-6,1-6 | |
| ITF W25 Feld Am See | 05/20 10:05 | 29 | Lara Salden v Sofia Costoulas | 3-6,1-6 | |
| ITF W25 Feld Am See | 05/19 09:00 | 28 | [326] Sofia Costoulas v Elvina Kalieva [243] | 6-2,6-3 | |
| ITF W25 Feld Am See | 05/18 08:00 | 27 | [345] Maja Chwalinska v Sofia Costoulas [326] | 4-6,4-6 | |
| ITF W25 Feld Am See | 05/17 11:00 | 26 | [367] Kayla Cross v Sofia Costoulas [326] | 7-5,5-7,3-6 | |
| ITF W25 Feld Am See | 05/17 07:30 | 25 | Arabella Koller v Sofia Costoulas | 6-4,4-6,1-6 | |
| ITF W25 Osijek | 04/27 10:40 | 26 | [334] Sofia Costoulas v Tena Lukas [233] | 4-6,1-6 | |
| ITF W25 Osijek | 04/26 09:30 | 25 | [334] Sofia Costoulas v Julia Avdeeva [465] | 2-6,6-3,7-6 | |
| ITF W60 Bellinzona | 04/17 12:35 | 24 | [342] Andrea Lazaro Garcia v Sofia Costoulas [358] | 7-5,6-3 | |
| ITF W25 Santa Margherita | 04/15 11:50 | 28 | [411] Andreea Prisacariu v Sofia Costoulas [360] | 6-1,1-6,6-2 | |
| ITF W25 Santa Margherita | 04/14 11:10 | 27 | Sofia Costoulas v Federica Bilardo | 6-4,6-4 | |
| ITF W25 Santa Margherita | 04/13 08:30 | 26 | [301] Matilde Paoletti v Sofia Costoulas [360] | 1-6,3-6 | |
| ITF W25 Santa Margherita | 04/11 14:15 | 25 | [360] Sofia Costoulas v Ikumi Yamazaki [426] | 7-6,6-2 | |
| ITF W60 Pretoria | 03/16 08:00 | 26 | [192] Ipek Oz v Sofia Costoulas [347] | 7-6,6-1 | |
| ITF W60 Pretoria | 03/14 09:25 | 25 | [347] Sofia Costoulas v Lucie Nguyen Tan [378] | 6-3,6-1 | |
| ITF W25 Pretoria | 03/11 08:00 | 28 | [347] Sofia Costoulas v Emina Bektas [325] | 3-6,6-4,6-7 | |
| ITF W25 Pretoria | 03/10 08:00 | 27 | [338] Jenny Duerst v Sofia Costoulas [347] | 4-6,3-6 | |
| ITF W25 Pretoria | 03/09 09:40 | 26 | [366] Alice Tubello v Sofia Costoulas [347] | 2-6,2-6 | |
| ITF W25 Pretoria | 03/08 09:50 | 25 | [347] Sofia Costoulas v Selena Janicijevic [210] | 7-6,7-5 | |
| ITF W25 Santo Domingo | 02/24 14:00 | 27 | [417] Stacey Fung v Sofia Costoulas [361] | 2-6,7-6,6-4 | |
| ITF W25 Santo Domingo | 02/23 16:35 | 26 | [361] Sofia Costoulas v Sada Nahimana [263] | 6-2,6-0 | |
| ITF W25 Santo Domingo | 02/22 13:30 | 25 | Sofia Costoulas v Eliessa Vanlangendonck | 6-3,0-6,6-3 | |
| ITF W25 Santo Domingo | 02/14 14:55 | 24 | Sofia Costoulas v Clara Vlasselaer | 6-4,3-6,6-7 | |
| ITF W40 Città del Messico | 02/07 15:30 | 25 | [364] Sofia Costoulas v Despina Papamichail [154] | 6-7,2-6 | |
| ITF W40 Città del Messico | 02/06 16:20 | 54 | [364] Sofia Costoulas v Rina Saigo [425] | 6-2,6-4 | |
| ITF W40 Città del Messico | 02/05 18:25 | 54 | Sofia Costoulas v Yuliana Monroy | 6-0,6-0 |
Sofia Costoulas (Genk, 2 aprile 2005) è una tennista belga.