| ITF Guam F1 | 06/20 00:00 | 25 | Numajiri, Keisuke v Barclay, David | 6-1,2-6,2-6 | |
| ITF Japan F8 | 06/11 00:30 | 62 | Kousuke Ogura v Numajiri, Keisuke | 6-2,6-1 | |
| ITF Japan F8 | 06/09 06:00 | 62 | Kato, Daiki v Numajiri, Keisuke | 6-7,2-6 | |
| ITF Japan F6 Qual | 04/07 03:30 | 62 | Daisuke Sumizawa v Numajiri, Keisuke | Retired | |
| ITF Japan F3 | 03/17 04:00 | 44 | Ito, Yuichi v Numajiri, Keisuke | Retired | |
| ITF Japan F3 | 03/17 00:30 | 44 | Watanuki, Keisuke v Numajiri, Keisuke | 3-6,1-6 | |
| ITF Japan F1 | 03/04 03:00 | 62 | Numajiri, Keisuke v Sasai, Masaki | 1-6,6-3,0-6 | |
| Turkey F8, Singles Qualifying | 02/24 09:30 | 62 | Numajiri, Keisuke v Davydov, Ivan | 1-6,7-6,5-7 | |
| ITF Turkey F7 | 02/17 06:30 | 62 | Bogdan Bobrov v Numajiri, Keisuke | 6-3,6-2 | |
| ITF Vietnam F3 | 11/21 06:10 | 25 | Katayama, Sho v Numajiri, Keisuke | 6-4,6-4 | |
| ITF Vietnam F3 | 11/20 04:00 | 44 | Lawrence Bataljin v Numajiri, Keisuke | 6-4,2-6,6-3 | |
| ITF Vietnam F2 | 11/12 04:00 | 44 | Jakub Paul v Numajiri, Keisuke | 6-7,6-4,6-1 | |
| ITF Vietnam F2 | 11/11 05:00 | 44 | Numajiri, Keisuke v Kawakami, Rimpei | Retired | |
| ITF Malaysia F3 | 10/29 00:00 | 62 | Ito, Yuichi v Numajiri, Keisuke | 6-4,6-2 | |
| ITF Malaysia F3 | 10/28 01:00 | 62 | Numajiri, Keisuke v Alex Hunt | 6-0,6-1 | |
| ITF Malaysia F2 | 10/22 01:00 | 62 | Lu, Tyler v Numajiri, Keisuke | 6-3,5-7,6-4 | |
| ITF Malaysia F2 | 10/21 04:30 | 62 | Numajiri, Keisuke v Daniel-Andrea Rodriguez-Redondo | 6-4,6-3 | |
| ITF Malaysia F1 | 10/18 02:25 | 25 | Numajiri, Keisuke v Podzus, Martins | 2-6,3-6 | |
| ITF Malaysia F1 | 10/16 01:00 | 44 | Numajiri, Keisuke v Du Toit, Daniel | 6-2,6-3 | |
| ITF Malaysia F1 | 10/15 01:00 | 44 | Numajiri, Keisuke v Zapata, Sebastian | 6-1,6-1 | |
| ITF Turkey F34 | 09/11 10:00 | 44 | Sandro Kopp v Numajiri, Keisuke | 6-2,6-2 | |
| ITF Turkey F32 | 08/27 12:30 | 44 | Numajiri, Keisuke v Sandro Kopp | 2-6,6-7 | |
| ITF Latvia F1 | 07/31 07:00 | 25 | Numajiri, Keisuke v Lebedyn, Alexander | 3-6,6-1,3-6 | |
| ITF Latvia F1 | 07/29 11:30 | 54 | Numajiri, Keisuke v Randpere, Martin Valdo | 6-2,6-4 | |
| ITF Estonia F1 | 07/25 08:00 | 25 | von Massow, George v Numajiri, Keisuke | 6-2,6-2 | |
| ITF Estonia F1 | 07/23 13:00 | 44 | Numajiri, Keisuke v Boerma, Pelle | 5-7,6-4,6-1 | |
| ITF Estonia F1 | 07/23 07:00 | 44 | Numajiri, Keisuke v Hedman, Alex | 6-3,6-2 | |
| ITF Lithuania F1 | 07/18 12:45 | 25 | Grigelis, Laurynas v Numajiri, Keisuke | 6-1,6-3 | |
| ITF Guam F1 | 06/22 01:30 | 26 | Numajiri, Keisuke v Moon, Ju-Hae | 3-6,3-6 | |
| ITF Guam F1 | 06/19 01:15 | 25 | Nordstrom, Per v Numajiri, Keisuke | 1-6,3-6 |