Stadium: Court 2 Round: 27 Ground: Hardcourt outdoor
| ITF Germany F13 | 2018/08/23 08:00 | Peter Heller v Johannes Haerteis | 6-1,6-0 |
| ITF M25 Manacor | 2022/01/13 11:45 | Peter Heller v Christian Sigsgaard | 6-2,6-4 |
| ITF M25 Manacor | 2022/01/12 10:00 | Peter Heller v Natan D'Hulst | 6-2,6-1 |
| ITF M15 Manacor | 2022/01/04 16:25 | Christian Sigsgaard v Peter Heller | 1-6,7-5,6-2 |
| Challenger Eckental | 2021/11/01 11:55 | Tobias Simon v Peter Heller | 6-2,6-4 |
| ITF M15 Antalya | 2021/10/26 08:25 | Peter Heller v Jack Pinnington Jones | 3-6,4-6 |
| Challenger Lisbon | 2021/09/27 09:00 | Santiago Rodriguez Taverna v Peter Heller | 7-6,7-5 |
| Challenger Lisbon | 2021/09/26 11:25 | Luis Faria v Peter Heller | 1-6,7-6,4-6 |
| Challenger Braga | 2021/09/21 09:00 | Thiago Monteiro v Peter Heller | 6-3,6-3 |
| ITF M25 Manacor | 2022/01/12 10:00 | Sandro Cottino v Johannes Haerteis | 6-4,3-6,4-6 |
| Challenger Manama | 2021/11/24 08:00 | Evgeny Karlovskiy v Johannes Haerteis | 6-3,6-1 |
| Challenger Manama | 2021/11/23 11:40 | Johannes Haerteis v Alexander Erler | 6-3,6-4 |
| Challenger Manama | 2021/11/22 08:00 | Johannes Haerteis v Alexandar Lazarov | 3-6,6-7 |
| Challenger Manama | 2021/11/21 10:05 | Johannes Haerteis v Ammar Faleh Alhogbani | 6-2,6-1 |
| Challenger Helsinki | 2021/11/14 09:00 | Johannes Haerteis v Viktor Durasovic | 4-6,6-7 |
| Challenger Eckental | 2021/11/02 18:15 | Maxime Cressy v Johannes Haerteis | 6-7,6-4,6-3 |
| Challenger Eckental | 2021/11/01 11:15 | Johannes Haerteis v Uladzimir Ignatik | 4-6,6-2,7-6 |