Stadium: Clay 4 Round: 25 Ground: Clay
| Challenger Szczecin | 2019/09/09 12:15 | Kacper Zuk v Zielinski, Jan | 6-7,7-6,6-2 |
| ITF M25 Poznan | 2019/08/20 12:00 | Denis Yevseyev v Zielinski, Jan | 7-6,6-0 |
| Bydgoszcz, Singles Qualifying M-ITF-POL-04A | 2019/08/17 13:20 | Daniel Michalski v Zielinski, Jan | 6-3,6-4 |
| Bydgoszcz, Singles Qualifying M-ITF-POL-04A | 2019/08/16 13:30 | Dougaz, Aziz v Zielinski, Jan | 3-6,3-6 |
| Bydgoszcz, Singles Qualifying M-ITF-POL-04A | 2019/08/15 08:00 | Zielinski, Jan v Wojcik, Yann | 6-3,6-4 |
| Bydgoszcz, Singles Qualifying M-ITF-POL-04A | 2019/08/13 12:00 | Smola, Maciej v Zielinski, Jan | 3-6,4-6 |
| ITF M15 Wroclaw | 2019/07/03 15:45 | Petr Nouza v Zielinski, Jan | 6-1,7-6 |
| ITF M25 Pardubice | 2019/06/25 09:45 | Zielinski, Jan v Georgii Kravchenko | 2-6,1-6 |
| Bucaramanga, Singles M-ITF-COL-01A | 2019/04/25 15:00 | Panta Herreros, Jorge Brian v Alejandro H Franco | 6-4,1-6,6-3 |
| Bucaramanga, Singles M-ITF-COL-01A | 2019/04/23 16:00 | Alejandro H Franco v Daniel Salazar | 6-1,6-1 |
| ITF M15 Guayaquil | 2019/04/18 17:55 | Fermin Tenti v Alejandro H Franco | 4-6,7-6,6-0 |
| ITF M15 Guayaquil | 2019/04/17 20:50 | Garcia Campoverde, Carlos v Alejandro H Franco | 1-6,0-6 |
| ITF M15 Cancun | 2019/04/08 14:30 | Statham, Mikal v Alejandro H Franco | 6-3,6-1 |
| ITF M15 Cancun | 2019/03/13 16:45 | Alejandro H Franco v Bradley, Julian | 5-7,1-6 |
| ITF M15 Cancun | 2019/03/11 20:00 | Statham, Mikal v Alejandro H Franco | 7-6,1-6,4-10 |
| ITF M15 Cancun | 2019/03/11 15:30 | Bachmaier, Philip v Alejandro H Franco | 2-6,6-2,7-10 |