Stadium: Tammsaare 4 Round: 25 Ground: Clay
| ITF - W60 Versmold | 2021/07/25 07:55 | Gina Marie Dittmann v Ekaterina Kazionova | 6-3,3-6,10-3 |
| ITF - W15 Moscova | 2021/07/22 08:20 | Ekaterina Kazionova v Nigina Abduraimova | 1-6,6-4,3-6 |
| ITF - W15 Moscova | 2021/07/21 09:55 | Ekaterina Kazionova v Ekaterina Khayrutdinova | 7-6,7-5 |
| ITF - W15 Moscova | 2021/07/20 07:00 | Ekaterina Kazionova v Victoria Mikhaylova | 6-4,6-0 |
| ITF - W15 Moscova | 2021/07/19 08:00 | Ekaterina Kazionova v Nikol Mishieva | 6-2,6-0 |
| ITF - W60 Nur-Sultan | 2021/07/13 07:00 | Ekaterina Kazionova v Gozal Ainitdinova | 2-6,4-6 |
| ITF - W25 Nur-Sultan | 2021/07/07 09:40 | Maria Timofeeva v Ekaterina Kazionova | 6-2,2-6,6-2 |
| ITF - W25 Madrid | 2021/06/09 09:50 | Ekaterina Kazionova v Karman Kaur Thandi | 1-6,4-6 |
| ITF - W25 Parnu | 2021/08/03 07:00 | Oleksandra Oliynykova v Jacquline Nylander Altelius | 6-2,6-3 |
| ITF - W25 Parnu | 2021/08/02 08:15 | Oleksandra Oliynykova v Elisabeth Iila | 6-1,6-1 |
| ITF - W60 Versmold | 2021/07/25 11:25 | Cristiana Ferrando v Oleksandra Oliynykova | 6-2,3-6,10-6 |
| UTR Pro Tennis Series - Ricany - Feminin | 2021/07/04 09:00 | Nastja Kolar v Oleksandra Oliynykova | 6-4,3-6,3-6 |
| UTR Pro Tennis Series - Ricany - Feminin | 2021/07/03 12:00 | Andrea Nova v Oleksandra Oliynykova | 0-6,1-6 |
| UTR Pro Tennis Series - Ricany - Feminin | 2021/07/01 11:00 | Oleksandra Oliynykova v Denisa Pospisilova | 6-1,5-1 |
| UTR Pro Tennis Series - Ricany - Feminin | 2021/06/30 12:45 | Oleksandra Oliynykova v Zdena Safarova | 6-3,3-6,5-2 |
| UTR Pro Tennis Series - Ricany - Feminin | 2021/06/29 13:30 | Oleksandra Oliynykova v Nelly Knezkova | 6-2,0-6,5-4 |