Stadium: Court 15 Round: 25 Ground: Hardcourt indoor
| Challenger Tulln | 2021/09/06 13:00 | Johannes Haerteis v Filip Horansky | 6-4,4-6,3-6 |
| Challenger Mallorca | 2021/09/01 18:40 | Johannes Haerteis v Lukas Lacko | 2-6,3-6 |
| Challenger Mallorca | 2021/08/31 08:00 | Nicolas Moreno De Alboran v Johannes Haerteis | 3-6,6-4,4-6 |
| Challenger Mallorca | 2021/08/30 08:00 | Sergio Martos Gornes v Johannes Haerteis | 1-6,1-6 |
| Challenger Prague | 2021/08/24 10:15 | Johannes Haerteis v Alex Rybakov | 4-6,2-6 |
| Challenger Luedenscheid | 2021/08/15 09:30 | Bogdan Bobrov v Johannes Haerteis | 1-6,6-4,6-3 |
| Challenger Meerbusch | 2021/08/08 16:05 | Ivan Nedelko v Johannes Haerteis | 7-6,6-3 |
| Challenger - Segovia | 2021/07/27 13:05 | Altug Celikbilek v Johannes Haerteis | 6-3,6-4 |
| ITF M25 Plaisir | 2021/09/13 15:25 | Leny Mitjana v Hugo Pierre | 6-1,6-0 |
| ITF M25 Plaisir | 2021/09/13 09:35 | Hendrik Jebens v Leny Mitjana | 7-5,2-6,4-10 |
| ITF M25 Plaisir | 2021/09/12 11:00 | Adrien Gobat v Leny Mitjana | 4-6,1-6 |
| ITF M15 Bressuire | 2020/01/21 12:35 | Leny Mitjana v Antoine Cornut-Chauvinc | 6-7,1-6 |
| ITF M25 Troyes | 2019/07/25 16:00 | Leny Mitjana v Maxime Hamou | 6-2,3-6,0-6 |
| ITF M25 Troyes | 2019/07/24 15:00 | Ivan Davydov v Leny Mitjana | 2-6,2-6 |
| Challenger Pau | 2019/02/25 13:20 | Norbert Gombos v Leny Mitjana | 6-4,6-1 |
| ITF M15 Grenoble | 2019/02/10 14:30 | Leny Mitjana v Yannick Mertens | 6-3,7-5 |