Stadion: Court 6 Round: 54 Ground: Hardcourt indoor
| ITF - M15 - Antalya | 2019/09/19 07:00 | Jan Zielinski v Marsel Ilhan | 5-7,4-6 |
| ITF - M15 - Antalya | 2019/09/18 07:40 | Jan Zielinski v Alejandro H Franco | 6-3,7-6 |
| Challenger - Stettin | 2019/09/09 12:15 | Kacper Zuk v Jan Zielinski | 6-7,7-6,6-2 |
| ITF - M25 - Posen | 2019/08/20 12:00 | Denis Yevseyev v Jan Zielinski | 7-6,6-0 |
| ITF - M25 - Bydgoszcz | 2019/08/17 13:20 | Daniel Michalski v Jan Zielinski | 6-3,6-4 |
| ITF - M25 - Bydgoszcz | 2019/08/16 13:30 | Mohamed Aziz Dougaz v Jan Zielinski | 3-6,3-6 |
| ITF - M25 - Bydgoszcz | 2019/08/15 08:00 | Jan Zielinski v Yann Wojcik | 6-3,6-4 |
| ITF - M25 - Bydgoszcz | 2019/08/13 12:00 | Maciej Smola v Jan Zielinski | 3-6,4-6 |
| ITF - M15 - Kalmar | 2019/05/14 09:40 | Marius Ruzgas v Oliver Johansson | 7-6,6-3 |
| ITF - M15 - Kalmar | 2019/05/13 13:15 | Oliver Johansson v Arvid Nordquist | 7-6,6-2 |