Stadium: Court 3 Round: 54 Ground: Hardcourt indoor
| ITF M25 Nussloch | 2020/01/20 16:00 | Leopold Zima v Jan Zielinski | 6-4,7-6 |
| ITF M25 Nussloch | 2020/01/20 10:25 | Marcus Mansson v Jan Zielinski | 7-6,4-6,8-10 |
| ITF M25 Nussloch | 2020/01/19 09:00 | Fred Olivier Schommer v Jan Zielinski | 2-6,2-6 |
| ITF M15 Irákleio | 2019/11/17 08:30 | Alexander Erler v Jan Zielinski | 7-5,6-1 |
| ITF M15 Irákleio | 2019/11/16 12:00 | Jan Zielinski v Patrick Kypson | 6-4,6-2 |
| ITF M15 Irákleio | 2019/11/16 08:00 | Jan Zielinski v Jonas Trinker | 6-3,6-2 |
| ITF M15 Irákleio | 2019/11/15 08:00 | Jan Zielinski v Vasil Kirkov | 6-3,6-3 |
| ITF M15 Irákleio | 2019/11/12 13:05 | Tom Kocevar-Desman v Jan Zielinski | 1-6,4-6 |
| ITF M25 Shrewsbury | 2019/09/23 10:10 | Harry Meehan v Luc Woodall | 6-0,6-1 |