Stadium: Court 1 Round: 25 Ground: Hardcourt outdoor
| Challenger Prague Qual | 2023/05/07 12:55 | Vitaliy Sachko v Johannes Haerteis | 5-7,6-2,6-1 |
| ITF M25 Sanxenxo | 2023/04/28 13:00 | Robert Strombachs v Johannes Haerteis | 7-6,6-4 |
| ITF M25 Sanxenxo | 2023/04/27 12:30 | Johannes Haerteis v Tao Mu | 6-4,6-1 |
| ITF M25 Sanxenxo | 2023/04/26 10:00 | Johannes Haerteis v Grigory Kuklin | 6-1,6-0 |
| ITF M15 Antalya | 2023/04/21 07:30 | Dragos Nicolae Madaras v Johannes Haerteis | 6-2,6-2 |
| ITF M15 Antalya | 2023/04/20 07:00 | Dan Alexandru Tomescu v Johannes Haerteis | 1-6,6-4,2-6 |
| ITF M15 Antalya | 2023/04/18 09:50 | Johannes Haerteis v Arthur Reymond | 6-4,6-2 |
| ITF M15 Antalya | 2023/04/12 07:00 | Daniele Capecchi v Johannes Haerteis | 4-6,6-3,6-2 |
| ITF M15 Helsinki | 2022/08/12 07:00 | Filip Peliwo v Iiro Vasa | 6-4,7-6 |
| ITF M15 Helsinki | 2022/08/11 10:00 | Iiro Vasa v Edison Ambarzumjan | 6-3,6-4 |
| ITF M15 Helsinki | 2022/08/10 13:50 | Max Cunat v Iiro Vasa | 6-4,3-6,3-6 |
| ITF M15 Parnu | 2022/08/03 09:10 | Robin Erik Parts v Iiro Vasa | 2-6,7-6,6-3 |
| ITF M15 Vejle | 2022/07/28 10:05 | Sandro Kopp v Iiro Vasa | 6-0,6-4 |
| ITF M15 Vejle | 2022/07/27 11:50 | Iiro Vasa v Jack Karlsson Winstrand | 6-2,6-3 |
| ITF M15 Vejle | 2022/07/25 17:55 | Iiro Vasa v Richard Biagiotti | 6-3,5-7,11-9 |
| ITF M15 Vejle | 2022/07/24 08:00 | Iiro Vasa v Oscar Dahlberg | 6-0,6-1 |