Stadium: CC Round: 54 Ground: Clay
| ITF Women Ortisei | 2018/12/17 15:05 | Natalia Siedliska v Proese, Natalie | 7-5,4-6,6-1 |
| Hong Kong, Simples W-ITF-HKG-01B | 2019/05/28 10:25 | Natalia Siedliska v Yui Chikaraishi | 3-6,2-6 |
| Karuizawa, Singles W-ITF-JPN-12A | 2019/05/21 06:20 | Natalia Siedliska v Xiaodi You | 2-6,6-4,6-4 |
| Singapour, Simples W-ITF-SGP-04A | 2019/05/16 03:55 | Valeria Savinykh v Natalia Siedliska | 7-6,6-1 |
| Singapour, Simples W-ITF-SGP-04A | 2019/05/15 03:25 | Uberoi, Nikita v Natalia Siedliska | 1-6,4-6 |
| Osprey, Fl, Singles Qualifying W-ITF-USA-14A | 2019/04/24 14:30 | Natalia Siedliska v Victoria Rodriguez | 7-6,2-6,6-2 |
| Osprey, Fl, Singles Qualifying W-ITF-USA-14A | 2019/04/23 16:10 | Nefedova, Anastasia Evgenyevna v Natalia Siedliska | 6-1,5-7,10-12 |
| Osprey, Fl, Singles Qualifying W-ITF-USA-14A | 2019/04/22 14:30 | Elizabeth K Bagerbaseh v Natalia Siedliska | 3-6,1-6 |
| Hong Kong, Simples W-ITF-HKG-01B | 2019/04/11 05:15 | Momoko Kobori v Natalia Siedliska | 5-7,6-0,6-2 |
| ITF Women Ortisei | 2018/12/17 15:05 | Natalia Siedliska v Proese, Natalie | 7-5,4-6,6-1 |
| ITF Women Jablonec Nad Nisou | 2018/12/05 14:35 | Proese, Natalie v Wysoczanska, Katarzyna | 1-6,2-6 |
| ITF Women Milovice | 2018/11/30 10:00 | Proese, Natalie v Nefisa Berberovic | 6-4,3-6,2-6 |
| ITF Women Milovice | 2018/11/29 13:30 | Timea Jaruskova v Proese, Natalie | 1-6,3-6 |
| ITF Women Milovice | 2018/11/28 09:00 | Karolina Vlckova v Proese, Natalie | 3-6,6-4,0-6 |
| ITF Women Milovice | 2018/11/28 09:00 | Karolina Vlckova v Proese, Natalie | 3-6,6-4,0-5 |
| ITF Women Milovice | 2018/11/27 13:20 | Proese, Natalie v Linda Sevcikova | 6-3,6-1 |
| ITF Women Milovice | 2018/11/26 14:00 | Proese, Natalie v Wysoczanska, Katarzyna | 6-3,6-4 |