| ITF - Bastad W35 | 05/09 08:10 | 26 | [457] Irina Fetecau v Sofia Costoulas [291] | Retired | |
| ITF - Bastad W35 | 05/07 11:25 | 25 | Maileen Nuudi v Sofia Costoulas | 2-6,6-7 | |
| Puchar Billie Jean King | 04/13 19:05 | 64 | Emma Navarro v Sofia Costoulas | Cancelled | |
| Puchar Billie Jean King | 04/12 22:00 | 64 | [5] Jessica Pegula v Sofia Costoulas [279] | 4-6,6-2,6-3 | |
| ITF - Kashiwa W50 | 04/05 03:15 | 27 | [356] Ya-Hsuan Lee v Sofia Costoulas [285] | 6-1,6-2 | |
| ITF - Kashiwa W50 | 04/04 03:30 | 26 | [285] Sofia Costoulas v Priscilla Hon [189] | 6-2,6-2 | |
| ITF - Kashiwa W50 | 04/02 03:40 | 25 | [285] Sofia Costoulas v Sohyun Park [299] | 6-2,6-2 | |
| ITF - Kofu W50 | 03/28 03:10 | 26 | [286] Sofia Costoulas v Destanee Aiava [196] | 3-6,4-6 | |
| ITF - Kofu W50 | 03/27 04:00 | 25 | Sofia Costoulas v Rin Nakagawara | 6-1,6-2 | |
| ITF - Hinode W15 | 03/23 01:00 | 28 | Sofia Costoulas v Maegan Manasse | 2-6,3-6 | |
| ITF - Hinode W15 | 03/22 00:55 | 27 | Sofia Costoulas v Dabin Kim | 3-6,6-3,6-0 | |
| ITF - Hinode W15 | 03/21 04:20 | 26 | Sofia Costoulas v Kisa Yoshioka | 6-0,6-3 | |
| ITF - Hinode W15 | 03/20 05:00 | 25 | Sofia Costoulas v Yui Chikaraishi | 6-0,6-2 | |
| ITF - Santo Domingo W35 | 03/13 13:25 | 25 | [279] Sofia Costoulas v Maria F H Gonzalez [205] | 6-0,3-6,3-6 | |
| ITF - Santo Domingo W35 | 03/08 15:15 | 27 | [226] Elvina Kalieva v Sofia Costoulas [279] | 6-7,6-4,6-0 | |
| ITF - Santo Domingo W35 | 03/07 16:15 | 26 | [278] Varvara Lepchenko v Sofia Costoulas [279] | 6-7,4-6 | |
| ITF - Santo Domingo W35 | 03/06 15:05 | 25 | [471] Maria Sara Popa v Sofia Costoulas [279] | 2-6,5-7 | |
| ITF - Pretoria W50 | 02/27 10:05 | 25 | [296] Jaeda Daniel v Sofia Costoulas [274] | 7-5,6-2 | |
| ITF - Pretoria W50 | 02/20 13:00 | 25 | [377] Kaylah McPhee v Sofia Costoulas [274] | 6-3,6-2 | |
| ITF - Roehampton W50 | 02/15 13:35 | 26 | [278] Nikola Bartunkova v Sofia Costoulas [276] | 6-3,6-1 | |
| ITF - Roehampton W50 | 02/14 09:55 | 25 | [493] Johanne C Svendsen v Sofia Costoulas [276] | 4-6,3-6 | |
| ITF - Rome (GA) W75 | 01/31 18:20 | 25 | [258] Sofia Costoulas v Valeriya Strakhova [242] | 3-6,7-5,4-6 | |
| ITF - Vero Beach W75 | 01/23 20:05 | 25 | [248] Sofia Costoulas v Sachia Vickery [137] | 6-2,3-6,2-6 | |
| ITF - Naples W35 | 01/18 14:50 | 26 | [248] Sofia Costoulas v Vivian Wolff [399] | 6-4,3-6,1-6 | |
| ITF - Naples W35 | 01/17 17:10 | 25 | [248] Sofia Costoulas v Victoria Osuigwe [441] | 3-6,6-2,6-2 | |
| ITF - Limassol W25 | 12/03 09:00 | 29 | [255] Silvia Ambrosio v Sofia Costoulas [296] | 1-6,3-6 | |
| ITF - Limassol W25 | 12/02 08:00 | 28 | [296] Sofia Costoulas v Anastasia Zakharova [192] | 7-6,7-5 | |
| ITF - Limassol W25 | 12/01 08:00 | 27 | [296] Sofia Costoulas v Polina Iatcenko [358] | 7-5,7-5 | |
| ITF - Limassol W25 | 11/30 08:00 | 26 | [296] Sofia Costoulas v Hanne Vandewinkel [343] | 7-5,6-1 | |
| ITF - Limassol W25 | 11/29 08:00 | 25 | Sofia Costoulas v Angelina Wirges | 3-6,7-6,6-0 |
Sofia Costoulas (ur. 2 kwietnia 2005) – belgijska tenisistka.