Stadium: Court 3 Round: 25 Ground: Clay
| ITF W15 Don Benito | 2021/07/21 07:00 | Tamara Kostic v Olga Parres Azcoitia | 7-5,0-6,4-6 |
| ITF W15 Don Benito | 2021/07/20 11:05 | Tamara Kostic v Claudia Martinez de Velasco | 6-2,6-3 |
| ITF W15 Don Benito | 2021/07/19 15:00 | Marina Benito v Tamara Kostic | 3-6,3-6 |
| ITF W15 Don Benito | 2021/07/18 17:00 | Tamara Kostic v Carmen Garri Murcia | 6-3,6-1 |
| ITF W15 Don Benito | 2021/07/18 07:15 | Tamara Kostic v Iman Khan | 7-6,6-7,10-8 |
| Austrian Tennis Championship Women | 2020/07/02 08:00 | Daniela Glanzer v Tamara Kostic | 7-6,6-1 |
| Austrian Tennis Championship Women | 2020/07/01 08:00 | Tamara Kostic v Tijana Zlatanovic | 4-6,6-4,6-4 |
| ITF W15 Warmbad-Villach | 2021/08/20 08:55 | Katarina Kuzmova v Yeon Woo Ku | 0-6,3-6 |
| ITF W15 Warmbad-Villach | 2021/08/19 08:00 | Romana Cisovska v Katarina Kuzmova | 1-6,6-2,6-7 |
| ITF W15 Warmbad-Villach | 2021/08/18 10:45 | Naima Karamoko v Katarina Kuzmova | 6-3,1-6,1-6 |
| ITF W15 Bratislava | 2021/08/11 08:00 | Katarina Kuzmova v Elena Malygina | 2-6,2-6 |
| ITF W15 Prokuplje | 2021/07/06 09:00 | Victoria Mboko v Katarina Kuzmova | 6-2,5-7,6-1 |
| ITF W15 Prokuplje | 2021/06/29 09:20 | Katarina Kuzmova v Ana L De La Nuez | 5-7,4-6 |
| ITF W15 Banja Luka | 2021/06/01 14:35 | Dorka Drahota Szabo v Katarina Kuzmova | 6-1,6-3 |
| ITF W15 Antalya | 2021/05/10 07:00 | Katarina Kuzmova v Selina Atay | 6-1,6-3 |