Round: 54 Ground: Hardcourt outdoor
| ITF Japan F8 | 2015/06/25 01:00 | Numajiri, Keisuke v Watanuki, Keisuke | 3-6,3-6 |
| ITF Japan F1 | 2016/03/05 03:00 | Numajiri, Keisuke v Kaito Uesugi | 2-6,6-3,3-6 |
| ITF Turkey F5 | 2016/02/01 09:30 | Numajiri, Keisuke v Kishi, Ryota | 2-6,2-6 |
| ITF Turkey F5 | 2016/01/30 08:00 | Numajiri, Keisuke v Balla, Peter | 4-6,6-3,6-4 |
| ITF Turkey F4 | 2016/01/23 08:00 | Domagoj Biljesko v Numajiri, Keisuke | 6-0,6-1 |
| ITF Turkey F3 | 2016/01/18 09:00 | Vadym Ursu v Numajiri, Keisuke | 6-7,6-3,6-4 |
| ITF Turkey F3 | 2016/01/17 08:30 | Major, Philip Wilbert v Numajiri, Keisuke | 3-6,3-6 |
| Qatar F5, Simples | 2015/12/09 13:30 | Joris De Loore v Numajiri, Keisuke | 6-1,6-3 |
| Qatar F5, Simples | 2015/12/08 12:35 | Numajiri, Keisuke v Ben Hassen, Ameur | 6-2,6-2 |
| ITF Japan F1 | 2016/03/10 02:35 | Niki, Takuto v Watanuki, Keisuke | 7-5,6-2 |
| ITF Japan F1 | 2016/03/07 01:00 | Watanuki, Keisuke v Kazuma Kawachi | 6-1,6-1 |
| ITF Japan F1 | 2016/03/06 03:00 | Watanuki, Keisuke v Sora Fukuda | 6-1,3-6,6-3 |
| ITF Japan F1 | 2016/03/05 03:00 | Watanuki, Keisuke v Yuichiro Inui | 6-2,6-3 |
| ITF Japan F8 | 2015/06/25 01:00 | Numajiri, Keisuke v Watanuki, Keisuke | 3-6,3-6 |
| ITF Japan F8 | 2015/06/24 02:45 | Watanuki, Keisuke v Ito, Yuichi | 6-1,7-5 |
| ITF Japan F7 | 2015/06/16 02:15 | Onozawa, Arata v Watanuki, Keisuke | 7-6,0-6,6-3 |
| ITF Japan F6 | 2015/06/11 02:55 | Niki, Takuto v Watanuki, Keisuke | 6-7,7-6,6-4 |