Stadium: Court 5 Round: 26 Ground: Synthetic outdoor
| ITF M15 Akishima | 2019/06/12 02:40 | Keisuke Saitoh v Kyohei Yamanaka | 6-1,6-3 |
| 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 Guam | 2019/06/09 00:00 | Gengo Kikuchi v Hiroyasu Ehara | 6-2,6-2 |
| ITF M15 Guam | 2019/06/08 00:00 | Gengo Kikuchi v Kento Takeuchi | 6-2,7-5 |
| ITF M15 Guam | 2019/06/07 01:50 | Jordi Samper-Montana v Gengo Kikuchi | 2-6,0-6 |
| ITF M15 Guam | 2019/06/06 02:55 | Kento Tagashira v Gengo Kikuchi | 2-6,2-6 |
| ITF M15 Guam | 2019/06/05 00:00 | Kyler Jirasook v Gengo Kikuchi | 2-6,2-6 |
| ITF M15 Karuizawa | 2019/05/31 02:40 | Gengo Kikuchi v Sora Fukuda | 6-4,4-6,0-6 |
| ITF M15 Karuizawa | 2019/05/30 06:15 | Gengo Kikuchi v Ren Nakamura | 6-2,6-2 |
| ITF M15 Karuizawa | 2019/05/29 02:30 | Gengo Kikuchi v Taketo Takamisawa | 6-0,6-1 |