Round: 1
| ITF - M25 Bydgoszcz | 2019/08/17 13:20 | Daniel Michalski v Jan Zielinski | 6-3,6-4 |
| Marbello Cup - Exhibition Series | 2020/06/02 09:10 | Daniel Michalski v Filip Kolasinski | 2-6,6-7 |
| Challenger - Bergamo | 2020/02/20 10:00 | Baptiste Crepatte v Daniel Michalski | 2-6,6-4,6-3 |
| Challenger - Bergamo | 2020/02/18 09:00 | Daniel Michalski v Francesco Maestrelli | 6-2,4-6,6-2 |
| ITF - M15 Antália | 2020/02/15 08:20 | Baran Cengiz v Daniel Michalski | 7-5,7-5 |
| ITF - M15 Antália | 2020/02/06 07:00 | Giovanni Fonio v Daniel Michalski | 4-6,6-4,6-3 |
| ITF - M15 Antália | 2020/02/05 07:00 | Gustaf Strom v Daniel Michalski | 6-7,0-6 |
| ITF - M15 Cairo | 2019/12/06 08:00 | Facundo Juarez v Daniel Michalski | 3-6,7-5,7-5 |
| ITF - M15 Cairo | 2019/12/05 09:00 | Dennis Uspensky v Daniel Michalski | 4-6,4-6 |
| Marbello Cup - Exhibition Series | 2020/06/02 07:00 | Jan Zielinski v Mateusz Terczynski | 4-6,6-3,10-6 |
| ITF - M25 Sunderland | 2020/02/24 11:40 | Jan Zielinski v George Houghton | 4-6,6-3,7-10 |
| ITF - M25 Sunderland | 2020/02/23 13:05 | Jan Zielinski v Harry Meehan | 4-6,6-4,11-9 |
| ITF - M25 Glasgow | 2020/02/19 10:00 | Jan Zielinski v Antoine Bellier | 4-6,4-6 |
| ITF - M25 Glasgow | 2020/02/17 14:25 | Jan Zielinski v Hendrik Jebens | 4-6,2-6 |
| ITF - M25 Glasgow | 2020/02/16 17:40 | Jan Zielinski v Euan Mcintosh | 6-4,6-2 |
| ITF - M25 Barnstaple | 2020/02/13 11:20 | Kacper Zuk v Jan Zielinski | 3-6,6-0,6-1 |
| ITF - M25 Barnstaple | 2020/02/12 13:05 | Jan Zielinski v Daniel Little | 6-3,6-4 |