Stadium: Court 2 Round: 44 Ground: Clay
| ITF W60 San Bartolome De Tirajana | 2021/08/08 10:00 | Erica Oosterhout v Dia Evtimova | 6-3,3-6,10-12 |
| ITF W25 Bydgoszcz | 2021/08/01 08:00 | Laura Radakovic v Erica Oosterhout | 0-6,6-3,10-5 |
| ITF W60 Grodzisk Mazowiecki | 2021/07/26 09:00 | Maria Lourdes Carle v Erica Oosterhout | 6-4,6-2 |
| ITF W60 Grodzisk Mazowiecki | 2021/07/25 08:00 | Erica Oosterhout v Iveta Dapkute | 6-2,7-6 |
| ITF W15 Don Benito | 2021/07/22 07:30 | Angelina Wirges v Erica Oosterhout | 6-3,6-4 |
| ITF W15 Don Benito | 2021/07/21 10:10 | Erica Oosterhout v Akilah James | 6-0,6-2 |
| ITF W15 Don Benito | 2021/07/20 14:20 | Erica Oosterhout v Anastasia Veselova | 6-2,6-2 |
| ITF W15 Don Benito | 2021/07/19 15:00 | Margaux Komano v Erica Oosterhout | 1-6,1-6 |
| ITF W60 San Bartolome De Tirajana | 2021/08/08 08:30 | Valeria Koussenkova v Olivia Tjandramulia | 1-6,2-6 |
| ITF W15 Don Benito | 2021/07/20 09:40 | Maria Dolores Lopez Martinez v Valeria Koussenkova | 6-3,6-3 |
| ITF W60 Vitoria-Gasteiz | 2021/07/12 10:30 | Maria Garcia Cid v Valeria Koussenkova | 6-1,6-1 |
| UTR Pro Tennis Series Barcelona Women | 2021/06/12 11:30 | Marina Bakkari v Valeria Koussenkova | 6-4,6-2 |
| UTR Pro Tennis Series Barcelona Women | 2021/06/11 09:30 | Valeria Koussenkova v Judit Hernandez Miranda | 6-1,1-1 |
| UTR Pro Tennis Series Barcelona Women | 2021/06/09 12:30 | Valeria Koussenkova v Nora Niedmers | 3-6,1-5 |
| UTR Pro Tennis Series Barcelona Women | 2021/06/08 08:00 | Valeria Koussenkova v Esther Lopez | 6-3,0-6,1-5 |
| UTR Pro Tennis Series Barcelona Women | 2021/06/07 08:00 | Elizabeth Jurna v Valeria Koussenkova | 6-1,5-4 |