Stadium: Court Central Round: 27 Ground: Clay
| ITF W25 Oeiras | 2021/04/29 10:00 | Nina Stadler v Diana Marcinkevica | 6-7,5-7 |
| ITF W25 Oeiras | 2021/04/28 11:30 | Martina Spigarelli v Diana Marcinkevica | 6-7,1-6 |
| ITF W25 Oeiras | 2021/04/19 12:30 | Sofya Lansere v Diana Marcinkevica | 6-3,6-3 |
| ITF W25 Cordoba | 2021/04/06 15:50 | Irene Burillo Escorihuela v Diana Marcinkevica | 6-4,6-3 |
| ITF W25 Villa Maria | 2021/03/30 17:55 | Despina Papamichail v Diana Marcinkevica | 1-6,7-6,6-3 |
| ITF W25 Buenos Aires | 2021/03/24 16:10 | Katharina Gerlach v Diana Marcinkevica | 6-0,6-1 |
| ITF W15 Manacor | 2021/03/12 09:00 | Leyre Romero Gormaz v Diana Marcinkevica | 7-6,2-6,6-4 |
| ITF W15 Manacor | 2021/03/11 10:50 | Tereza Mihalikova v Diana Marcinkevica | 2-6,2-6 |
| ITF W25 Oeiras | 2021/04/29 12:40 | Kamilla Bartone v Marina Melnikova | 2-6,1-6 |
| ITF W25 Oeiras | 2021/04/28 10:00 | Ganna Poznikhirenko v Marina Melnikova | 6-3,4-6,1-6 |
| ITF W25 Oeiras | 2021/04/23 11:00 | Marina Melnikova v Seone Mendez | 6-3,2-6,5-7 |
| ITF W25 Oeiras | 2021/04/22 14:00 | Chloe Paquet v Marina Melnikova | 6-2,4-6,3-6 |
| ITF W25 Oeiras | 2021/04/21 13:30 | Francisca Jorge v Marina Melnikova | 2-6,5-7 |
| ITF W60 Oeiras | 2021/04/15 11:25 | Alexandra Dulgheru v Marina Melnikova | 6-3,2-6,6-3 |
| WTA Bogota | 2021/04/04 17:30 | Nuria Parrizas-Diaz v Marina Melnikova | 7-6,4-6,6-1 |
| WTA Bogota | 2021/04/03 16:25 | Katarzyna Piter v Marina Melnikova | 5-7,0-6 |