Stadium: Court 5 Round: 25 Ground: Synthetic outdoor
| ITF M15 Kashiwa | 2019/04/04 01:00 | Yusuke Takahashi v Keisuke Saitoh | 6-2,6-1 |
| ITF M15 Kofu | 2019/03/19 01:00 | Keisuke Saitoh v Jumpei Yamasaki | 2-6,3-6 |
| ITF - M15 Nishi-Tokyo | 2019/03/13 01:00 | Shuichi Sekiguchi v Keisuke Saitoh | 6-3,6-2 |
| ITF M15 Nishi-Tama | 2019/03/08 02:40 | Seong Chan Hong v Keisuke Saitoh | 6-3,6-0 |
| ITF M15 Nishi-Tama | 2019/03/06 01:00 | Soichiro Moritani v Keisuke Saitoh | 2-6,0-6 |
| ITF M15 Akishima | 2019/06/11 05:00 | Winter Meagher v Kyohei Yamanaka | 0-6,4-6 |
| ITF M15 Akishima | 2019/06/11 00:00 | Kyohei Yamanaka v Kento Tagashira | 6-1,3-6,10-5 |
| ITF Japan F8 | 2018/06/09 05:30 | Kazuki Shimizu v Kyohei Yamanaka | 6-1,7-6 |
| ITF Japan F8 | 2018/06/09 01:00 | Akito Higa v Kyohei Yamanaka | 2-6,2-6 |
| ITF Japan F7 Qual | 2018/06/03 02:50 | Ryota Kishi v Kyohei Yamanaka | 6-1,6-2 |
| ITF Japan F7 Qual | 2018/06/02 01:00 | Kyohei Yamanaka v Christopher Cajigan | 7-6,6-0 |