Round: 25 Ground: Hardcourt indoor
| Challenger Scheveningen | 2017/07/17 12:00 | von Massow, George v Stakhovsky, Sergiy | 6-7,2-6 |
| Challenger Scheveningen Qual | 2017/07/16 13:30 | de Valk, Roy Sarut v von Massow, George | 3-6,2-6 |
| Challenger Scheveningen Qual | 2017/07/15 09:25 | Alekseenko, Vadim v von Massow, George | 0-6,1-6 |
| Braunchsweig, Germany | 2017/07/11 13:50 | Maden, Yannick v von Massow, George | 6-1,7-6 |
| Challenger Braunschweig Qual | 2017/07/09 09:00 | von Massow, George v Pedro Sakamoto | 6-0,6-2 |
| Challenger Braunschweig Qual | 2017/07/08 08:00 | Tallon Griekspoor v von Massow, George | 6-4,2-6,3-6 |
| ITF Germany F5 | 2017/06/30 11:00 | von Massow, George v Alexander Vasilenko | 4-6,4-6 |
| ITF Germany F5 | 2017/06/29 10:35 | von Massow, George v Nik Razborsek | 2-6,6-0,6-1 |
| ITF Estonia F1 | 2017/07/23 13:00 | Numajiri, Keisuke v Boerma, Pelle | 5-7,6-4,6-1 |
| ITF Estonia F1 | 2017/07/23 07:00 | Numajiri, Keisuke v Hedman, Alex | 6-3,6-2 |
| ITF Lithuania F1 | 2017/07/18 12:45 | Grigelis, Laurynas v Numajiri, Keisuke | 6-1,6-3 |
| ITF Guam F1 | 2017/06/22 01:30 | Numajiri, Keisuke v Moon, Ju-Hae | 3-6,3-6 |
| ITF Guam F1 | 2017/06/19 01:15 | Nordstrom, Per v Numajiri, Keisuke | 1-6,3-6 |
| ITF Japan F7 | 2017/06/03 04:00 | Kato, Shoma v Numajiri, Keisuke | 6-4,6-1 |
| ITF Turkey F19 Qual | 2017/05/14 07:00 | Numajiri, Keisuke v Pavlioutchenkov, Alexander | 5-7,6-2,3-6 |
| ITF Turkey F18 | 2017/05/10 08:05 | Dennis Novak v Numajiri, Keisuke | 6-1,6-0 |