Stadium: Court 2 Round: 25 Ground: Clay
| ITF Germany F13 | 2018/08/23 08:00 | Peter Heller v Haerteis, Johannes | 6-1,6-0 |
| ITF Germany F13 | 2018/08/21 15:00 | Fallert, Florian v Haerteis, Johannes | 2-6,3-6 |
| Challenger Pullach Qual | 2018/08/04 15:55 | Alexandre Muller v Haerteis, Johannes | 7-6,7-5 |
| Challenger Sopot Qual | 2018/07/29 09:00 | Marcora, Roberto v Haerteis, Johannes | 6-4,7-5 |
| Challenger Sopot Qual | 2018/07/28 10:40 | Haerteis, Johannes v Gajewski, Kamil | 6-3,6-2 |
| ITF Austria F3 | 2018/07/19 15:00 | Haerteis, Johannes v Nerman Fatic | 2-6,6-7 |
| ITF Austria F3 | 2018/07/18 09:30 | Mariano Kestelboim v Haerteis, Johannes | 2-6,7-5,2-6 |
| ITF Austria F3 | 2018/07/17 13:15 | Huber, Gabriel v Haerteis, Johannes | 2-6,1-6 |
| ITF Romania F12 | 2018/09/07 10:10 | Gabi Adrian Boitan v Frunza, Nicolae | 0-6,1-6 |
| ITF Romania F12 | 2018/09/06 07:00 | Gabi Adrian Boitan v Luncanu, Petru-Alexandru | 6-4,6-3 |
| ITF Romania F12 | 2018/09/03 06:00 | Gabi Adrian Boitan v Hidalgo, Gabriel Alejandro | 6-4,3-6,6-4 |
| ITF Romania F12 | 2018/09/01 06:00 | Gabi Adrian Boitan v Marshall Tutu | 6-2,6-3 |
| ITF Romania F11 | 2018/08/30 07:00 | Gabi Adrian Boitan v Madaras, Dragos Nicolae | 3-6,4-6 |
| ITF Romania F11 | 2018/08/28 07:00 | Fetisleam, Edris v Gabi Adrian Boitan | 6-4,2-6,3-6 |
| ITF Romania F10 | 2018/08/21 07:00 | Gabi Adrian Boitan v Nicholas David Ionel | 1-6,3-6 |
| ITF Romania F9 | 2018/08/16 12:20 | Rodriguez, Cristian v Gabi Adrian Boitan | 6-0,6-1 |