Stadium: Center Court Round: 25 Ground: Clay
| ITF W25 Koksijde | 2021/08/10 13:40 | Angela Fita Boluda v Sofia Costoulas | 6-3,6-2 |
| ITF W25 Denain | 2021/06/16 08:00 | Dalila Spiteri v Sofia Costoulas | 6-2,6-1 |
| ITF - W15 Antalya | 2021/03/17 13:10 | Polina Leykina v Sofia Costoulas | 4-6,6-3,6-3 |
| ITF - W15 Antalya | 2021/03/10 07:00 | Markova, Johana v Sofia Costoulas | 6-2,0-6,6-4 |
| ITF - W15 Antalya | 2021/03/04 09:10 | Sofia Costoulas v Nuria Brancaccio | 0-6,2-6 |
| ITF - W15 Antalya | 2021/03/03 10:05 | Dea Herdzelas v Sofia Costoulas | 6-2,3-6,1-6 |
| ITF - W15 Sharm El Sheikh | 2021/02/11 10:30 | Sofia Costoulas v Nefisa Berberovic | 2-6,2-6 |
| ITF - W15 Sharm El Sheikh | 2021/02/10 11:25 | Lauren Proctor v Sofia Costoulas | 0-6,1-6 |
| ITF W25 Hamburg | 2021/01/10 11:30 | Rosca, Ioana Loredana v Carolina Kuhl | 6-1,6-4 |