Stadion: Court 1 Round: 26 Ground: Clay
| ITF - Österreich F3 | 2018/07/17 14:35 | Mariano Kestelboim v Arklon H D Pino | 6-1,6-2 |
| Challenger - Braunschweig - Qualifikation | 2018/07/08 10:55 | Marvin Netuschil v Mariano Kestelboim | 6-3,6-1 |
| Challenger - Braunschweig - Qualifikation | 2018/07/07 12:30 | George Von Massow v Mariano Kestelboim | 4-6,6-2,3-6 |
| ITF - Tschechien F4 | 2018/06/26 10:20 | Mariano Kestelboim v Tadeas Paroulek | 5-7,3-6 |
| ITF Hungary F4 | 2018/06/12 10:20 | Tim Van Rijthoven v Mariano Kestelboim | 6-3,6-4 |
| ITF - Italien F6 | 2018/04/03 13:55 | Mariano Kestelboim v Billy Harris | 4-6,1-6 |
| ITF - Tunesien F12 | 2018/03/31 09:00 | Hernan Casanova v Mariano Kestelboim | 6-1,6-3 |
| ITF - Tunesien F12 | 2018/03/30 08:30 | Mariano Kestelboim v Clement Geens | 6-1,6-3 |
| ITF - Österreich F3 | 2018/07/17 13:15 | Gabriel Huber v Johannes Haerteis | 2-6,1-6 |
| ITF - Österreich F2 | 2018/07/14 12:00 | Nerman Fatic v Johannes Haerteis | 1-6,6-3,6-1 |
| ITF - Österreich F2 | 2018/07/13 12:40 | Johannes Haerteis v Eduardo Dischinger | 6-1,1-6,6-3 |
| ITF - Österreich F2 | 2018/07/12 11:15 | Alexandar Lazarov v Johannes Haerteis | 3-6,2-6 |
| ITF - Österreich F2 | 2018/07/11 09:00 | Alexander Weis v Johannes Haerteis | 2-6,6-4,6-7 |
| ITF - Österreich F2 | 2018/07/09 12:00 | Johannes Haerteis v Jonathan Stenberg | 6-1,7-5 |
| Challenger - Marburg - Qualifikation | 2018/06/30 12:40 | Johannes Haerteis v Daniel Masur | 4-6,4-6 |
| Challenger - L'Aquila | 2018/06/19 10:00 | Johannes Haerteis v Riccardo Balzerani | 6-4,2-6,4-6 |