Stadion: Main Court (7) Round: 26 Ground: Clay
| ITF - M15 - Koszalin | 2019/08/10 11:50 | David Poljak v Michal Dembek | 6-3,6-4 |
| ITF - M25 - Grodzisk Mazowiecki | 2021/08/04 17:10 | David Poljak v Szymon Kielan | 7-5,6-3 |
| Challenger - Posen | 2021/07/27 16:25 | Elmar Ejupovic v David Poljak | 6-2,6-4 |
| Challenger - Posen | 2021/07/26 11:35 | David Poljak v Lucas Gerch | 7-5,1-6,6-4 |
| Challenger - Posen | 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 |
| ITF - M25 - Grodzisk Mazowiecki | 2021/08/03 08:55 | Alan Bojarski v Michal Dembek | 3-6,6-4,2-6 |
| ITF - M25 - Telawi | 2021/07/31 08:40 | Michal Dembek v Alessandro Ingarao | 2-6,1-6 |
| ITF - M25 - Telawi | 2021/07/30 05:55 | Michal Dembek v Alexander Boborykin | 7-5,6-2 |
| Polen - National Tour | 2021/07/11 16:00 | Michal Dembek v Aleksander Orlikowski | 2-6,6-7 |
| ITF - M25 - Wroclaw | 2021/07/01 11:40 | Alexander Shevchenko v Michal Dembek | 6-4,6-2 |
| ITF - M25 - Wroclaw | 2021/06/30 10:45 | Michal Dembek v Mohamed Aziz Dougaz | 6-2,6-4 |
| ITF - M15 - Antalya | 2021/06/16 16:25 | Michal Dembek v Christopher Heyman | 0-6,2-6 |
| ITF - M15 - Novomoskovsk | 2021/05/27 10:40 | Michal Dembek v Felix Gill | 3-6,5-7 |