Stadium: Court 6 Round: 27 Ground: Clay
| ITF Romania F13 | 2018/09/11 06:30 | Haerteis, Johannes v Gabi Adrian Boitan | 6-3,6-2 |
| ITF M15 Cluj Napoca | 2023/06/21 09:10 | Dan Alexandru Tomescu v Haerteis, Johannes | 4-6,2-6 |
| ITF M15 Cluj Napoca | 2023/06/20 06:25 | Haerteis, Johannes v Mihai Alexandru Coman | 6-4,7-6 |
| ITF M15 Vaasa | 2023/06/07 12:45 | Haerteis, Johannes v Iiro Vasa | 4-6,1-6 |
| Challenger Prague Qual | 2023/05/07 12:55 | Vitaliy Sachko v Haerteis, Johannes | 5-7,6-2,6-1 |
| ITF M25 Sanxenxo | 2023/04/28 13:00 | Robert Strombachs v Haerteis, Johannes | 7-6,6-4 |
| ITF M25 Sanxenxo | 2023/04/27 12:30 | Haerteis, Johannes v Tao Mu | 6-4,6-1 |
| ITF M25 Sanxenxo | 2023/04/26 10:00 | Haerteis, Johannes v Grigory Kuklin | 6-1,6-0 |
| ITF - M15 Antalya | 2023/04/21 07:30 | Madaras, Dragos Nicolae v Haerteis, Johannes | 6-2,6-2 |
| ITF M15 Cluj Napoca | 2023/06/21 11:10 | Manda, Calin v Gabi Adrian Boitan | 1-6,4-6 |
| ITF M15 Cluj Napoca | 2023/06/20 10:00 | Alen Bill v Gabi Adrian Boitan | 1-6,0-6 |
| Challenger Palmas del Mar | 2023/06/11 21:50 | Rodrigues, Daniel v Gabi Adrian Boitan | 6-2,7-5 |
| ITF - M15 Orange Park | 2023/05/04 16:50 | Gabi Adrian Boitan v Roberto Cid Subervi | 7-6,3-6,3-6 |
| ITF - M15 Orange Park | 2023/05/03 19:20 | Gabi Adrian Boitan v Ryan Haviland | 6-2,6-1 |
| ITF - M15 Vero Beach | 2023/04/27 17:05 | Gabi Adrian Boitan v Jaycer Lyeons | 4-6,7-6,6-7 |
| ITF - M15 Vero Beach | 2023/04/26 19:40 | Gabi Adrian Boitan v Kaylan Bigun | 7-6,6-1 |
| ITF - M15 Lons-le-Saunier | 2023/04/05 11:15 | Luca Castelnuovo v Gabi Adrian Boitan | 6-7,7-6,7-6 |