Stadium: Court 6 Round: 25 Ground: Hardcourt outdoor
| UTR Pro Tennis Series - Sofia - Kvinder | 2021/09/02 10:00 | Martha Matoula v Nastja Kolar | 6-4,1-1 |
| UTR Pro Tennis Series - Sofia - Kvinder | 2021/09/01 08:00 | Maja Radenkovic v Nastja Kolar | 6-2,0-6,0-6 |
| UTR Pro Tennis Series - Sofia - Kvinder | 2021/08/31 09:30 | Mirela Shkumbova v Nastja Kolar | 2-6,6-2,1-5 |
| ITF W25 - Braunschweig | 2021/08/26 09:00 | Nastja Kolar v Katharina Hobgarski | 2-6,4-6 |
| ITF W25 - Braunschweig | 2021/08/25 09:00 | Helene Pellicano v Nastja Kolar | 0-6,3-6 |
| UTR Pro Tennis Series - Zadar - Kvinder | 2021/08/11 09:30 | Nastja Kolar v Ema Bolebruchova | 6-1,1-1 |
| UTR Pro Tennis Series - Zadar - Kvinder | 2021/08/09 09:30 | Sara Mikaca v Nastja Kolar | 1-6,0-5 |
| ITF W25 - Parnu | 2021/08/05 08:30 | Anna Siskova v Nastja Kolar | 6-1,6-3 |