| UTR Pro Pazardzhik Women | 2021/05/12 08:30 | Nastja Kolar v Silvia Maria Costache | 6-2,6-0 |
| ITF W15 Giza | 2021/12/29 10:00 | Sandra Samir v Silvia Maria Costache | 6-1,6-2 |
| ITF W15 Giza | 2021/12/28 08:00 | Anna Borovinskaya v Silvia Maria Costache | 3-6,4-6 |
| ITF W15 Lousada | 2021/11/28 09:00 | Silvia Maria Costache v Valentina Losciale | 2-6,1-6 |
| UTR Pro Tennis Series Bucharest Women | 2021/10/08 11:30 | Silvia Maria Costache v Stefania Bojica | 4-6,4-6 |
| UTR Pro Tennis Series Bucharest Women | 2021/10/07 16:45 | Silvia Maria Costache v Iulia Andreea Ionescu | 7-6,4-6,5-4 |
| UTR Pro Tennis Series Bucharest Women | 2021/10/07 09:30 | Silvia Maria Costache v Aneta Kucmova | 6-3,3-6,4-5 |
| UTR Pro Tennis Series Bucharest Women | 2021/10/06 10:00 | Nicoleta-Catalina Dascalu v Silvia Maria Costache | 4-6,2-6 |
| UTR Pro Tennis Series Bucharest Women | 2021/10/05 11:30 | Tania Munteanu v Silvia Maria Costache | 2-6,1-5 |
| UTR Pro Tennis Series Plovdiv Women | 2021/12/16 09:00 | Ekaterina Vl. Makarova v Nastja Kolar | 6-3,6-4 |
| UTR Pro Tennis Series Plovdiv Women | 2021/12/14 07:30 | Gabriela Duca v Nastja Kolar | 6-3,1-6,5-7 |
| UTR Pro Tennis Series Barcelona Women | 2021/12/11 12:30 | Darja Semenistaja v Nastja Kolar | 0-6,7-5,7-6 |
| UTR Pro Tennis Series Barcelona Women | 2021/12/10 11:00 | Nastja Kolar v Silvia Martinez Jimenez | 6-2,6-2 |
| UTR Pro Tennis Series Barcelona Women | 2021/12/09 11:00 | Nastja Kolar v Kristyna Hrabalova | 6-1,6-4 |
| UTR Pro Tennis Series Barcelona Women | 2021/12/08 10:30 | Ivonne Cavalle-Reimers v Nastja Kolar | 4-6,6-4,6-2 |
| UTR Pro Tennis Series Zadar Women | 2021/11/29 12:30 | Nastja Kolar v Victoria Borodulina | 6-2,6-2 |
| UTR Pro Tennis Series Zadar Women | 2021/11/29 09:51 | Nastja Kolar v Andjela Lopicic | 6-0,6-3 |