Estádio: Court 3 Round: 25 Ground: Hardcourt outdoor
| ITF - M15 Antália | 2023/04/21 07:30 | Dragos Nicolae Madaras v Johannes Haerteis | 6-2,6-2 |
| ITF - M15 Antália | 2023/04/20 07:00 | Dan Alexandru Tomescu v Johannes Haerteis | 1-6,6-4,2-6 |
| ITF - M15 Antália | 2023/04/18 09:50 | Johannes Haerteis v Arthur Reymond | 6-4,6-2 |
| ITF - M15 Antália | 2023/04/12 07:00 | Daniele Capecchi v Johannes Haerteis | 4-6,6-3,6-2 |
| ITF - M25 Trento | 2023/03/30 15:00 | Giovanni Oradini v Johannes Haerteis | 6-4,6-0 |
| ITF - M25 Trento | 2023/03/29 07:30 | Aliaksandr Bulitski v Johannes Haerteis | 2-6,2-6 |
| Challenger - Bienna | 2023/03/19 15:05 | Francesco Forti v Johannes Haerteis | 4-6,6-4,7-5 |
| ITF - M25 Trimbach | 2023/03/15 11:30 | Johannes Haerteis v Marcello Serafini | 4-6,7-5,4-6 |
| ITF - M25 Sanxenxo | 2023/04/25 07:55 | Zhenxiong Dong v Grigory Kuklin | 4-6,1-6 |
| ITF - M25 Sanxenxo | 2023/04/24 12:00 | Grigory Kuklin v Areg Stepanian | 6-3,6-2 |
| ITF - M25 Reus | 2023/04/02 10:00 | Pere Prat Turro v Grigory Kuklin | 2-6,7-6,10-3 |
| UTR Pro - Barcelona | 2023/03/11 08:30 | Nazim Makhlouf v Grigory Kuklin | 3-6,6-3,7-5 |
| UTR Pro - Barcelona | 2023/03/10 07:00 | Grigory Kuklin v Julio Cesar Porras | 3-6,1-6 |
| UTR Pro - Barcelona | 2023/03/09 07:00 | Grigory Kuklin v Alen Moritz Hodzic | 6-2,6-7,5-4 |
| UTR Pro - Barcelona | 2023/03/08 09:30 | Lamine Ouahab v Grigory Kuklin | 6-2,6-2 |
| UTR Pro - Barcelona | 2023/03/07 11:38 | Ricardo Villacorta-Alonso v Grigory Kuklin | 5-7,6-1,6-1 |