Stadium: Court 3 Round: 27 Ground: Hardcourt indoor
| ITF M25 - Hamborg | 2021/10/21 15:45 | Johannes Haerteis v Leonard Von Hindte | 6-3,6-4 |
| ITF M25 - Hamborg | 2021/10/20 10:50 | Johannes Haerteis v Riccardo Balzerani | 6-3,6-4 |
| ITF M25 - Jönköping | 2021/09/20 10:45 | Filip Bergevi v Johannes Haerteis | 6-4,7-6 |
| ITF M25 - Plaisir | 2021/09/15 11:45 | Johannes Haerteis v Leny Mitjana | 4-6,6-7 |
| 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 |
| ITF M25 - Hamborg | 2021/10/21 08:00 | Daniel Little v Vladyslav Orlov | 7-5,6-1 |
| ITF M25 - Hamborg | 2021/10/19 09:25 | Daniel Little v Tom Gentzsch | 6-4,6-2 |
| ITF M25 - Hamborg | 2021/10/17 17:15 | Daniel Little v Mateusz Terczynski | 6-4,6-0 |
| ITF M25 - Falun | 2021/09/30 16:15 | Daniel Little v Khumoyun Sultanov | 4-6,2-6 |
| ITF M25 - Falun | 2021/09/29 12:30 | Daniel Little v Harry Wendelken | 6-3,6-3 |
| ITF M25 - Falun | 2021/09/28 13:15 | Tobias Simon v Daniel Little | 6-7,3-6 |
| ITF M25 - Falun | 2021/09/27 09:20 | Karl Friberg v Daniel Little | 1-6,2-6 |
| ITF M25 - Falun | 2021/09/26 11:00 | Nikolaj Katic v Daniel Little | 6-7,4-6 |