Stadium: Court 21 Round: 25 Ground: Clay
| ITF - M15 Antalya | 2023/04/12 07:00 | Capecchi, Daniele v Haerteis, Johannes | 4-6,6-3,6-2 |
| ITF - M25 Trente | 2023/03/30 15:00 | Giovanni Oradini v Haerteis, Johannes | 6-4,6-0 |
| ITF - M25 Trente | 2023/03/29 07:30 | Bulitski, Aliaksandr v Haerteis, Johannes | 2-6,2-6 |
| Challenger Biel | 2023/03/19 15:05 | Francesco Forti v Haerteis, Johannes | 4-6,6-4,7-5 |
| ITF - M25 Trimbach | 2023/03/15 11:30 | Haerteis, Johannes v Marcello Serafini | 4-6,7-5,4-6 |
| ITF - M15 Oberhaching | 2023/02/15 12:25 | Veldheer, Mick v Haerteis, Johannes | 3-6,6-4,6-4 |
| ITF M25 Bath | 2023/02/07 12:10 | George Loffhagen v Haerteis, Johannes | 6-3,6-3 |
| Challenger - Koblenz | 2023/01/31 17:35 | Alexey Vatutin v Haerteis, Johannes | 7-6,6-1 |
| ITF - M15 Antalya | 2023/04/12 07:00 | Arthur Reymond v Fermin Tenti | 7-5,3-6,3-6 |
| ITF - M25 Trente | 2023/03/30 13:25 | Alastair Gray v Arthur Reymond | 6-2,6-4 |
| ITF - M25 Trente | 2023/03/29 09:40 | Luigi Sorrentino v Arthur Reymond | 6-4,3-6,3-6 |
| ITF - M25 Toulouse | 2023/03/23 16:40 | Rigele Te v Arthur Reymond | 6-7,6-2,7-6 |
| ITF - M25 Toulouse | 2023/03/21 16:15 | Arthur Reymond v August Holmgren | 6-3,6-4 |
| ITF - M15 Antalya | 2023/03/10 07:00 | Arthur Reymond v Jorge Martinez Martinez | 1-6,6-4,5-7 |
| ITF - M15 Antalya | 2023/03/09 09:15 | Arthur Reymond v Filippo Speziali | 6-2,6-7,7-5 |
| ITF - M15 Antalya | 2023/03/08 11:40 | Arthur Reymond v Ivanov, Simon Anthony | 6-2,6-4 |