Stadium: Court 2 Round: 25 Ground: Hardcourt indoor
| ITF W25 Budapest | 2021/09/29 13:40 | Reka-Luca Jani v Zaja, Anna | 6-4,6-1 |
| ITF W80 Wiesbaden | 2021/09/22 14:30 | Marina Melnikova v Zaja, Anna | 7-5,6-1 |
| WTA Karlsruhe | 2021/09/07 08:00 | Gatto-Monticone, Giulia v Zaja, Anna | 1-6,6-4,6-3 |
| ITF W60 Prerov | 2021/08/25 07:55 | Nikola Bartunkova v Zaja, Anna | 6-3,6-4 |
| ITF W60 San Bartolome De Tirajana | 2021/08/18 13:10 | Ashley Lahey v Zaja, Anna | 7-6,7-6 |
| ITF W60 Versmold | 2021/07/30 15:25 | Zaja, Anna v Ferrando, Cristiana | 1-6,3-6 |
| ITF W60 Versmold | 2021/07/29 15:30 | Hogenkamp, Richel v Zaja, Anna | 6-7,2-6 |
| ITF W60 Versmold | 2021/07/28 16:35 | Zaja, Anna v Sofia Shapatava | 6-1,3-6,6-1 |
| ITF W25 Hamburg | 2021/10/18 16:45 | Olga Helmi v Eliessa Vanlangendonck | 6-4,6-1 |
| ITF W25 Hamburg | 2021/10/18 11:25 | Olga Helmi v Samavati, Sofia Nami | 6-4,3-6,10-2 |
| ITF W25 Lagos | 2021/10/12 11:30 | Anna Turati v Olga Helmi | 7-5,6-2 |
| ITF W25 Lagos | 2021/10/11 14:30 | Maria Beatriz Teixeira v Olga Helmi | 1-6,1-6 |
| ITF - W15 Monastir | 2021/09/29 15:35 | Mack, Mia v Olga Helmi | 7-6,6-4 |
| ITF - W15 Monastir | 2021/09/26 08:30 | Olga Helmi v Clara Vlasselaer | 6-1,6-3 |
| ITF - W15 Monastir | 2021/09/25 08:30 | Olga Helmi v Elena Milovanovic | 6-4,6-0 |
| ITF - W15 Monastir | 2021/09/24 10:10 | Olga Helmi v Jattavapornvanit, Pimrada | 6-4,4-6,6-2 |