| UTR Pro Tennis Series Mulheim Women | 2022/04/27 07:30 | Natalia Siedliska v Sokovic, Nevena | 7-5,5-3 |
| UTR Pro Tennis Series Mulheim Women | 2022/04/26 09:00 | Natalia Siedliska v Annemarie Lazar | 6-1,5-1 |
| UTR Pro Tennis Series Mulheim Women | 2022/04/25 10:30 | Natalia Siedliska v Anna Ozerova | 6-3,5-1 |
| ITF W15 Cancun | 2022/01/29 15:30 | Julie Belgraver v Natalia Siedliska | 2-6,7-5,6-2 |
| ITF W15 Cancun | 2022/01/28 16:00 | Haine Ogata v Natalia Siedliska | 0-6,0-6 |
| ITF W15 Cancun | 2022/01/27 20:55 | Hosonuma, Chisa v Natalia Siedliska | 6-7,6-7 |
| ITF W15 Cancun | 2022/01/25 17:35 | Astrid Cirotte v Natalia Siedliska | 5-7,1-6 |
| ITF W15 Cancun | 2022/01/22 15:00 | Natalia Siedliska v Maria Jose Portillo Ramirez | 6-7,2-6 |
| ITF Women Essen Qual | 2018/06/11 15:05 | Barritza, Karen v Jacob, Katharina | 6-1,6-0 |
| ITF Women Essen Qual | 2018/06/10 15:15 | Jacob, Katharina v Fiona Ganz | 6-4,6-2 |
| ITF Women Essen Qual | 2018/06/10 07:00 | Bulatovic, Carolina v Jacob, Katharina | 0-6,6-7 |
| ITF Women Essen | 2017/06/05 09:00 | Merel Hoedt v Jacob, Katharina | 6-2,6-3 |
| Altenkirchen, Qualifications Simples W-WITF-GER-02A | 2017/02/11 09:30 | Jacob, Katharina v Kraus, Livia | 3-6,3-6 |
| ITF Women Ismaning | 2016/10/17 07:00 | Novotna, Karolina v Jacob, Katharina | 6-0,6-1 |