Stadium: Court 11 Round: 46
| Turkey F8, Singles Qualifying | 2017/02/28 11:00 | Mariano Kestelboim v von Massow, George | 7-6,4-6,4-6 |
| Challenger Braunschweig Qual | 2018/07/07 07:30 | von Massow, George v Sorgi, Joao Pedro | 7-5,3-6,6-2 |
| Challenger Marburg Qual | 2018/06/30 17:30 | Lindell, Christian v von Massow, George | 7-6,7-5 |
| ITF Netherlands F1 | 2018/06/26 16:00 | von Massow, George v Watson, Andrew | 6-7,6-7 |
| ITF Germany F4 | 2018/06/22 11:45 | von Massow, George v Dimitar Kuzmanov | 4-6,3-6 |
| ITF Germany F4 | 2018/06/22 08:00 | von Massow, George v Robert Strombachs | 6-2,6-3 |
| ITF Germany F4 | 2018/06/20 11:50 | von Massow, George v Ruepke, Lukas | 6-4,6-2 |
| Turkey F15, Singles Qualifying | 2018/04/17 07:30 | Nejedly, Pavel v von Massow, George | 7-6,6-4 |
| Turkey F14, Singles Qualifying | 2018/04/11 08:45 | von Massow, George v Sebastian Baez | 1-6,1-6 |
| 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 | Tim Van Rijthoven 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 Tunisia F12 | 2018/03/29 08:30 | Mariano Kestelboim v Jotovski, Tomislav | 6-2,6-1 |
| ITF Tunisia F12 | 2018/03/28 14:00 | Mariano Kestelboim v Dowson, Dan | 6-3,6-0 |
| ITF Tunisia F11 | 2018/03/20 08:30 | Saez, Juan Carlos v Mariano Kestelboim | 6-2,6-3 |