Round: 25 Ground: Hardcourt outdoor
| 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 파블리우첸코브, 알렉산더 | 5-7,6-2,3-6 |
| ITF Turkey F18 | 2017/05/10 08:05 | 노바크, 데니스 v Numajiri, Keisuke | 6-1,6-0 |
| Turkey F14, Singles Qualifying | 2017/04/10 07:30 | Numajiri, Keisuke v Brtnicky, Filip | 1-6,3-6 |
| Turkey F14, Singles Qualifying | 2017/04/09 07:00 | Numajiri, Keisuke v Ben Abdennibi, Sami | 6-2,3-6,6-3 |
| ITF Turkey F13 | 2017/04/02 07:30 | Numajiri, Keisuke v 투르켈, 메르트 나시 | 7-6,2-6,3-6 |
| Turkey F12, Singles Qualifying | 2017/03/28 09:20 | Cagnina, Julien v Numajiri, Keisuke | 6-1,6-1 |
| Turkey F12, Singles Qualifying | 2017/03/27 07:00 | 아가비건, 사르프 v Numajiri, Keisuke | 2-6,3-6 |