Stadium: Court 6 Round: 25 Ground: Hardcourt indoor
| ITF M25 Stockholm | 2019/09/24 10:50 | Jan Zielinski v Aleksei Khomich | 6-2,6-1 |
| ITF M25 Stockholm | 2019/09/23 10:35 | Jan Zielinski v Oliver Johansson | 6-2,6-3 |
| 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 Szczecin | 2019/09/09 12:15 | Kacper Zuk v Jan Zielinski | 6-7,7-6,6-2 |
| ITF M25 Poznan | 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 Stockholm | 2019/09/24 09:00 | Masi Sarpola v Lucas Renard | 6-7,1-6 |
| ITF M25 Stockholm | 2019/09/23 09:00 | Karl Fredrik Utheim v Lucas Renard | 2-6,3-6 |
| ITF M25 Madrid | 2019/09/16 10:30 | Alvaro Blanco Damea v Lucas Renard | 7-6,3-6,11-9 |
| ITF M25 Madrid | 2019/09/15 12:00 | Hans Albert Schubert v Lucas Renard | 1-6,4-6 |
| ITF M15 Ystad | 2019/08/08 08:45 | Lucas Renard v Robin Thour | 6-2,5-7,4-6 |
| ITF M15 Ystad | 2019/08/06 14:35 | Dragos Nicolae Madaras v Lucas Renard | 2-6,4-6 |
| ITF M25 Taipei | 2019/07/24 02:00 | Yusuke Takahashi v Lucas Renard | 5-7,7-6,6-2 |
| ITF M25 Taipei | 2019/07/23 04:30 | Lucas Renard v Sergey Shipilov | 2-6,7-6,10-7 |