Stadium: Court 2 Round: 19 Ground: Clay
| ITF Germany F16 | 2015/10/13 10:40 | David Poljak v Johannes Haerteis | 4-6,1-6 |
| Challenger Ortisei | 2020/11/19 10:00 | Johannes Haerteis v Ilya Ivashka | 6-7,3-6 |
| Challenger Ortisei | 2020/11/17 09:00 | Daniel Masur v Johannes Haerteis | 3-6,7-6,3-6 |
| Challenger Ortisei | 2020/11/15 10:00 | Alexey Vatutin v Johannes Haerteis | 3-6,6-3,3-6 |
| Challenger Ortisei | 2020/11/14 09:00 | Johannes Haerteis v Viktor Galovic | 4-6,7-6,6-4 |
| Challenger Bratislava | 2020/11/08 11:00 | Johannes Haerteis v Julian Lenz | 7-6,4-6,6-7 |
| Challenger Eckental | 2020/11/04 12:55 | Sebastian Korda v Johannes Haerteis | 6-2,1-6,6-1 |
| Challenger Eckental | 2020/11/02 18:40 | Yannick Maden v Johannes Haerteis | 2-6,6-4,3-6 |
| Challenger Eckental | 2020/11/01 13:15 | Lukas Klein v Johannes Haerteis | 1-6,4-6 |
| Czechia Extraliga | 2020/12/16 10:00 | David Poljak v Michael Vrbensky | 6-3,6-1 |
| Czechia Extraliga | 2020/12/14 10:35 | David Poljak v Vojtech Vlkovsky | 6-0,6-1 |
| Czechia Extraliga | 2020/12/12 10:00 | David Poljak v Petr Michnev | 6-4,4-6,6-4 |
| ITF M15 Bratislava | 2020/11/26 10:40 | Danylo Kalenichenko v David Poljak | 4-6,6-2,7-6 |
| ITF M15 Bratislava | 2020/11/24 13:00 | Pavel Nejedly v David Poljak | 3-6,6-7 |
| ITF M15 Sharm El Sheikh | 2020/11/12 08:00 | David Poljak v Felix Corwin | 5-7,6-3,7-5 |
| ITF M15 Sharm El Sheikh | 2020/11/11 12:05 | David Poljak v Lilian Breut | 6-0,4-6,6-4 |
| ITF M15 Sharm El Sheikh | 2020/11/06 08:00 | Alessandro Bega v David Poljak | 6-7,7-6,6-4 |