Stadium: Court 5 Round: 54 Ground: Hardcourt outdoor
| ITF W25 Punta Cana | 2023/07/11 12:50 | Mell E R Gonzalez v Natalia Kowalczyk | 6-1,6-0 |
| ITF W25 Punta Cana | 2023/07/09 15:30 | Andanin Vilas v Natalia Kowalczyk | 3-6,1-6 |
| ITF W25 Punta Cana | 2023/07/03 16:00 | Ani Vangelova v Natalia Kowalczyk | 6-2,6-0 |
| ITF W25 Punta Cana | 2023/07/02 15:30 | Rajmohan, Niditra v Natalia Kowalczyk | 5-7,6-7 |
| ITF W40 Otocec | 2023/05/21 11:10 | Natalia Kowalczyk v Ana Grubor | 4-6,1-6 |
| ITF W25 Kursumlijska Banja | 2023/05/15 07:00 | Pia Lovric v Natalia Kowalczyk | 6-2,6-0 |
| ITF W25 Kursumlijska Banja | 2023/05/14 10:30 | Mia Sarcev v Natalia Kowalczyk | 4-6,2-6 |
| ITF W25 Bujumbura | 2023/04/13 09:40 | Natalia Kowalczyk v Jasmijn Gimbrere | 2-6,3-6 |