Stadium: Court 2 Round: 25 Ground: Clay
| Challenger Eckental | 2018/10/27 10:20 | Leopold Zima v David Poljak | 4-6,4-6 |
| Challenger Sibiu | 2021/09/26 07:30 | Yan Bondarevskiy v David Poljak | 7-5,3-6,6-3 |
| Challenger Bucharest | 2021/09/19 09:45 | David Poljak v Uladzimir Ignatik | 4-6,1-6 |
| Challenger Banja Luka | 2021/09/07 08:00 | David Poljak v Tomas Martin Etcheverry | 2-6,5-7 |
| Challenger Banja Luka | 2021/09/06 11:35 | David Poljak v Mircea-Alexandru Jecan | 6-3,6-4 |
| Challenger Banja Luka | 2021/09/05 12:25 | David Poljak v Moez Echargui | 2-6,6-3,6-2 |
| Challenger Warsaw | 2021/08/22 12:15 | Jonathan Mridha v David Poljak | 2-6,6-4,6-2 |
| ITF M25 Prostejov | 2021/08/17 09:00 | Alex Rybakov v David Poljak | 7-6,7-6 |
| ITF M25 Grodzisk Mazowiecki | 2021/08/08 08:00 | David Poljak v Zsombor Piros | 4-6,6-7 |
| ITF M25 Falun | 2021/09/29 15:20 | Vasil Kirkov v Leopold Zima | 6-4,6-4 |
| ITF M25 Falun | 2021/09/28 10:55 | Leopold Zima v Marvin Moeller | 6-3,6-3 |
| ITF M25 Falun | 2021/09/27 10:20 | Leopold Zima v Jonathan Stenberg | 6-4,6-4 |
| ITF M25 Falun | 2021/09/26 08:00 | Leopold Zima v Nicolas Kobelt | 6-4,6-2 |
| ITF M25 Trier | 2021/08/25 09:00 | Marvin Moeller v Leopold Zima | 6-1,7-5 |
| ITF M25 Trier | 2021/08/23 15:05 | Leopold Zima v Benito Sanchez Martinez | 6-1,7-5 |
| ITF M25 Trier | 2021/08/23 10:30 | Leopold Zima v Lennart Melzer | 6-1,6-1 |
| ITF M25 Ueberlingen | 2021/08/19 12:30 | Ergi Kirkin v Leopold Zima | 5-7,6-0,6-3 |