| ITF W25 Santo Domingo | 02/22 13:30 | 25 | Costoulas, Sofia v 반란겐돈크, 엘리에사 | 6-3,0-6,6-3 | |
| ITF W25 Santo Domingo | 02/14 14:55 | 24 | Costoulas, Sofia v 블라셀라어, 클라라 | 6-4,3-6,6-7 | |
| ITF W40 Mexico City | 02/07 15:30 | 25 | [364] Costoulas, Sofia v 파파미차일, 데스피나 [154] | 6-7,2-6 | |
| ITF W40 Mexico City | 02/06 16:20 | 54 | [364] Costoulas, Sofia v 사이고, 리나 [425] | 6-2,6-4 | |
| ITF W40 Mexico City | 02/05 18:25 | 54 | Costoulas, Sofia v 몬로이, 율리아나 | 6-0,6-0 | |
| ITF W40 Mexico City | 02/03 19:40 | 28 | [128] 위안, 위에 v Costoulas, Sofia [406] | 6-4,6-1 | |
| ITF W40 Mexico City | 02/02 18:30 | 27 | [406] Costoulas, Sofia v 클루시코, 리나 [260] | 6-3,6-3 | |
| ITF W40 Mexico City | 02/01 17:20 | 26 | [406] Costoulas, Sofia v 카시노, 에스텔 [141] | 6-2,6-1 | |
| ITF W40 Mexico City | 01/31 19:35 | 25 | [210] 라멘스, 수잔 v Costoulas, Sofia [406] | 5-7,0-6 | |
| ITF W25 Buenos Aires | 01/18 14:15 | 25 | 사우반트, 챈탈 v Costoulas, Sofia | 6-7,6-4,6-1 | |
| ITF W25 Buenos Aires | 01/14 13:00 | 28 | [441] Costoulas, Sofia v 브란카시오, 누리아 [265] | 2-6,3-6 | |
| ITF W25 Buenos Aires | 01/13 14:00 | 27 | [441] Costoulas, Sofia v 마르티네즈 시레즈, 카를로타 [315] | 6-2,6-0 | |
| ITF W25 Buenos Aires | 01/12 17:50 | 26 | [390] 리자라조, 율리아나 v Costoulas, Sofia [441] | 6-4,1-6,2-6 | |
| ITF W25 Buenos Aires | 01/11 14:35 | 25 | 시에드리스카, 나탈리아 v Costoulas, Sofia | 6-4,5-7,2-6 | |
| ITF W25 Petange | 11/25 11:00 | 27 | [433] Costoulas, Sofia v 켐펜, 마갈리 [241] | 4-6,3-6 | |
| ITF W25 Petange | 11/24 10:00 | 26 | 로파테츠카, 다리아 v Costoulas, Sofia | 7-5,5-7,2-6 | |
| ITF W25 Petange | 11/23 15:00 | 25 | [433] Costoulas, Sofia v 알비에, 아우드레이 [318] | 6-7,7-6,6-2 | |
| ITF W25 Sharm El Sheikh | 11/16 07:30 | 25 | [440] 가토-몬티콘, 기울리아 v Costoulas, Sofia [430] | 6-3,6-3 | |
| ITF W25 Loughborough | 10/26 10:30 | 26 | 쿠브카, 마르티나 v Costoulas, Sofia | Walkover | |
| ITF W25 Loughborough | 10/25 15:00 | 25 | [449] Costoulas, Sofia v 미야자키, 유리코 릴리 [215] | 6-2,3-6,6-3 | |
| ITF W25 Loughborough | 10/24 10:40 | 54 | Costoulas, Sofia v 허트친슨, 홀리 | 6-3,7-6 | |
| ITF W25 Hua Hin | 10/12 05:20 | 25 | Costoulas, Sofia v 세마, 에리카 | 3-6,5-7 | |
| ITF W25 Hua Hin | 10/08 03:55 | 28 | [496] Costoulas, Sofia v 여우, 시아우디 [304] | 6-4,1-6,2-6 | |
| ITF W25 Hua Hin | 10/07 07:30 | 27 | [457] 마, 예신 v Costoulas, Sofia [496] | 2-6,6-3,5-7 | |
| ITF W25 Hua Hin | 10/06 07:05 | 26 | Costoulas, Sofia v 찬타, 아운치사 | 4-6,6-4,6-0 | |
| ITF W25 Hua Hin | 10/05 05:50 | 25 | 블라셀라어, 클라라 v Costoulas, Sofia | 3-6,3-6 | |
| ITF W25 Vigo | 08/25 11:00 | 26 | 여우, 시아우디 v Costoulas, Sofia | 6-0,6-4 | |
| ITF W25 Vigo | 08/24 08:55 | 25 | 리나레스 도밍고, 루시아 v Costoulas, Sofia | 2-6,0-6 | |
| ITF W25 Foxhills | 08/02 09:00 | 25 | Costoulas, Sofia v 쉰, 팡잉 | 6-2,3-6,4-6 | |
| ITF W25 Gurugram | 06/30 04:00 | 26 | Costoulas, Sofia v 라이나, 안키타 | Retired |
Sofia Costoulas (born 2 April 2005) is a Belgian tennis player.
Costoulas has a Greek–Congolese father and a Belgian mother.
Costoulas has a career-high singles ranking by the Women's Tennis Association (WTA) of 248 and a best doubles ranking of 229.
On the ITF Junior Circuit, she had a career-high combined ranking of No. 2, achieved on 18 April 2022. She lost the girls' singles final of the 2022 Australian Open to Petra Marčinko. She had already reached the Wimbledon junior doubles final in 2021.