| ITF Japan F3 | 03/22 02:25 | 25 | Numajiri, Keisuke v Soonwoo Kwon | 5-7,3-6 | |
| ITF Japan F3 | 03/20 02:30 | 44 | Numajiri, Keisuke v Onoda, Ken | 7-5,6-1 | |
| ITF Japan F2 | 03/12 00:30 | 54 | Numajiri, Keisuke v Watanuki, Keisuke | 6-2,2-6,1-6 | |
| ITF Japan F1 | 03/05 03:00 | 62 | Numajiri, Keisuke v Kaito Uesugi | 2-6,6-3,3-6 | |
| ITF Turkey F5 | 02/01 09:30 | 62 | Numajiri, Keisuke v Kishi, Ryota | 2-6,2-6 | |
| ITF Turkey F5 | 01/30 08:00 | 62 | Numajiri, Keisuke v Balla, Peter | 4-6,6-3,6-4 | |
| ITF Turkey F4 | 01/23 08:00 | 62 | Domagoj Biljesko v Numajiri, Keisuke | 6-0,6-1 | |
| ITF Turkey F3 | 01/18 09:00 | 44 | Vadym Ursu v Numajiri, Keisuke | 6-7,6-3,6-4 | |
| ITF Turkey F3 | 01/17 08:30 | 44 | Major, Philip Wilbert v Numajiri, Keisuke | 3-6,3-6 | |
| Qatar F5, Simples | 12/09 13:30 | 26 | Joris De Loore v Numajiri, Keisuke | 6-1,6-3 | |
| Qatar F5, Simples | 12/08 12:35 | 25 | Numajiri, Keisuke v Ben Hassen, Ameur | 6-2,6-2 | |
| ITF Qatar F5 Qual | 12/06 13:40 | 54 | Numajiri, Keisuke v AL Awadhi, Omar | 6-3,6-4 | |
| ITF Qatar F5 Qual | 12/05 17:35 | 54 | Numajiri, Keisuke v Alshatti, Abdulhameed | 6-1,6-1 | |
| ITF Qatar F4 | 12/01 11:10 | 25 | Clayton, Scott v Numajiri, Keisuke | 6-4,6-2 | |
| ITF Qatar F4 Qual | 11/29 13:00 | 54 | Numajiri, Keisuke v Saidkarimov, Saida' Lo | 6-3,6-4 | |
| Kuwait F3, Singles Qualifying | 11/22 07:00 | 54 | Numajiri, Keisuke v Sharma, Arpit | 6-0,6-1 | |
| ITF Kuwait F2 | 11/15 07:00 | 54 | Numajiri, Keisuke v Allemby, James | 6-3,6-4 | |
| ITF Kuwait F2 | 11/14 07:00 | 54 | Numajiri, Keisuke v Yusuf Khamis | 7-6,6-2 | |
| ITF Turkey F36 | 09/06 13:00 | 62 | Numajiri, Keisuke v Alexander Babanine | 4-6,3-6 | |
| ITF Turkey F35 | 09/03 13:00 | 26 | Numajiri, Keisuke v Konecny, Michal | 1-6,5-7 | |
| ITF Serbia F6 | 07/20 08:00 | - | Kiyamov, Timur v Numajiri, Keisuke | 6-1,7-5 | |
| ITF Serbia F6 | 07/18 11:00 | - | Barclay, David v Numajiri, Keisuke | 2-6,2-6 | |
| ITF Serbia F6 | 07/11 11:00 | - | Numajiri, Keisuke v Markovic, Goran | 6-4,6-4 | |
| ITF Japan F8 | 06/25 01:00 | - | Numajiri, Keisuke v Watanuki, Keisuke | 3-6,3-6 | |
| ITF Japan F7 | 06/18 02:10 | - | Numajiri, Keisuke v Moon, Ju-Hae | Walkover | |
| ITF Japan F7 Qual | 06/15 00:30 | - | Renta Tokuda v Numajiri, Keisuke | 3-6,1-6 | |
| ITF Japan F7 Qual | 06/13 00:00 | - | Kai, Naoto v Numajiri, Keisuke | 2-6,3-6 | |
| ITF Japan F6 Qual | 06/07 05:00 | - | Sano, Koichi v Numajiri, Keisuke | 6-0,4-6,6-1 | |
| ITF USA F16 | 05/09 16:00 | - | Lunn, Justin v Numajiri, Keisuke | 3-6,2-6 | |
| ITF USA F16 | 05/08 20:00 | - | Donaldson, Brandon v Numajiri, Keisuke | 1-6,2-6 |