Stadium: Court 1 Round: 26 Ground: Clay
| ITF Austria F3 | 2018/07/17 14:35 | Mariano Kestelboim v Huertas Del Pino Cordova, Arklon | 6-1,6-2 |
| Challenger Braunschweig Qual | 2018/07/08 10:55 | Netuschil, Marvin v Mariano Kestelboim | 6-3,6-1 |
| Challenger Braunschweig Qual | 2018/07/07 12:30 | von Massow, George v Mariano Kestelboim | 4-6,6-2,3-6 |
| ITF Czech Republic F4 | 2018/06/26 10:20 | Mariano Kestelboim v Paroulek, Tadeas | 5-7,3-6 |
| ITF Hungary F4 | 2018/06/12 10:20 | van Rijthoven, Tim v Mariano Kestelboim | 6-3,6-4 |
| ITF Italy F6 | 2018/04/03 13:55 | Mariano Kestelboim v Billy Harris | 4-6,1-6 |
| ITF Tunisia F12 | 2018/03/31 09:00 | Hernan Casanova v Mariano Kestelboim | 6-1,6-3 |
| ITF Tunisia F12 | 2018/03/30 08:30 | Mariano Kestelboim v Geens, Clement | 6-1,6-3 |
| ITF Austria F3 | 2018/07/17 13:15 | Huber, Gabriel v Haerteis, Johannes | 2-6,1-6 |
| ITF Austria F2 | 2018/07/14 12:00 | Nerman Fatic v Haerteis, Johannes | 1-6,6-3,6-1 |
| ITF Austria F2 | 2018/07/13 12:40 | Haerteis, Johannes v Dischinger, Eduardo | 6-1,1-6,6-3 |
| ITF Austria F2 | 2018/07/12 11:15 | Alexandar Lazarov v Haerteis, Johannes | 3-6,2-6 |
| ITF Austria F2 | 2018/07/11 09:00 | Alexander Weis v Haerteis, Johannes | 2-6,6-4,6-7 |
| ITF Austria F2 | 2018/07/09 12:00 | Haerteis, Johannes v Jonathan Stenberg | 6-1,7-5 |
| Challenger Marburg Qual | 2018/06/30 12:40 | Haerteis, Johannes v Daniel Masur | 4-6,4-6 |
| L'Aquila, Italie | 2018/06/19 10:00 | Haerteis, Johannes v Balzerani, Riccardo | 6-4,2-6,4-6 |