Stadium: Court 4 Round: 26 Ground: Clay
| ITF W15 L'Aquila | 2021/06/23 08:30 | Caijsa W Hennemann v Natalia Siedliska | 2-6,4-6 |
| ITF W15 Antalya | 2021/06/08 08:40 | Natalia Siedliska v Anet A Koskel | 6-2,6-0 |
| ITF W15 Antalya | 2021/06/04 07:25 | Manon Arcangioli v Natalia Siedliska | 7-6,2-6,6-2 |
| ITF W15 Antalya | 2021/06/03 07:30 | Vivien Sandberg v Natalia Siedliska | 2-6,3-6 |
| ITF W15 Antalya | 2021/06/01 07:00 | Iman Khan v Natalia Siedliska | 6-4,0-6,1-6 |
| ITF W15 Antalya | 2021/05/12 08:40 | Caijsa W Hennemann v Natalia Siedliska | 7-5,7-5 |
| ITF W15 Antalya | 2021/05/04 09:10 | Natalia Siedliska v Ekaterina Shalimova | 6-4,0-6,5-7 |
| ITF W15 Cairo | 2021/04/28 08:00 | Zoe Kruger v Natalia Siedliska | 6-3,6-4 |