Stadium: Court 9 Round: 25 Ground: Clay
| Challenger Poznan | 2021/07/27 16:25 | Elmar Ejupovic v David Poljak | 6-2,6-4 |
| Challenger Poznan | 2021/07/26 11:35 | David Poljak v Lucas Gerch | 7-5,1-6,6-4 |
| Challenger Poznan | 2021/07/25 13:25 | Thomaz Bellucci v David Poljak | 6-4,3-6,1-6 |
| ITF M25 Kottingbrunn | 2021/07/22 08:00 | Mate Valkusz v David Poljak | 6-7,7-5,7-5 |
| ITF M25 Kottingbrunn | 2021/07/20 12:10 | Niklas Waldner v David Poljak | 7-6,2-6,6-7 |
| Challenger Iasi | 2021/07/13 12:15 | Zdenek Kolar v David Poljak | 6-2,7-5 |
| Challenger Iasi | 2021/07/12 08:00 | Vlad Andrei Dancu v David Poljak | 2-6,0-6 |
| Challenger Iasi | 2021/07/11 09:20 | Mircea-Alexandru Jecan v David Poljak | 4-6,0-6 |
| Polish National Tour | 2021/07/11 10:00 | Kamil Majchrzak v Szymon Kielan | 6-1,7-6 |
| ITF M25 Wroclaw | 2021/06/30 13:15 | Gonzalo Lama v Szymon Kielan | 6-1,6-2 |
| ITF M25 Wroclaw | 2021/06/29 08:00 | Szymon Kielan v Mateusz Terczynski | 6-3,6-2 |
| ITF M25 Wroclaw | 2021/06/28 11:00 | Lewie Lane v Szymon Kielan | 3-6,0-6 |
| ITF M25 Wroclaw | 2021/06/27 12:30 | Szymon Kielan v Stepan Pecak | 4-6,6-4,10-8 |
| ITF M25 Poznan | 2020/08/23 11:00 | Leyton Rivera v Szymon Kielan | 4-6,6-3,10-3 |
| Polish National Tour | 2020/08/20 07:00 | Filip Kolasinski v Szymon Kielan | 6-2,7-6 |
| Polish National Tour | 2020/07/24 07:00 | Szymon Kielan v Michal Mikula | 2-6,3-6 |