Stadium: Court 5 Round: 62 Ground: Clay
| ITF M15 Nonthaburi | 2019/11/26 07:20 | Taisei Ichikawa v Ji Sung Nam | 5-7,2-6 |
| Challenger Kobe | 2019/11/07 02:00 | Yosuke Watanuki v Taisei Ichikawa | 6-2,6-1 |
| Challenger Kobe | 2019/11/06 04:45 | Taisei Ichikawa v Enrique Lopez-Perez | 5-7,6-2,7-6 |
| Challenger Kobe | 2019/11/05 02:45 | Timur Khabibulin v Taisei Ichikawa | 0-6,2-6 |
| ITF M15 Nanchang | 2019/10/04 04:40 | Ye Cong Mo v Taisei Ichikawa | 7-5,4-6,6-3 |
| ITF M15 Nanchang | 2019/10/03 05:00 | Natthasith Kunsuwan v Taisei Ichikawa | 0-6,6-7 |
| ITF M15 Nanchang | 2019/10/01 02:00 | Tianjia Guo v Taisei Ichikawa | 0-6,0-6 |
| ITF M15 Nanchang | 2019/09/27 04:10 | Taisei Ichikawa v Takashi Saito | 4-6,6-2,3-6 |
| ITF M25 Nonthaburi | 2020/02/02 03:40 | Yuki Mochizuki v Keisuke Saitoh | 6-3,6-0 |
| ITF M25 Nonthaburi | 2020/01/27 04:25 | Ben Patael v Keisuke Saitoh | 6-3,6-2 |
| ITF M25 Nonthaburi | 2020/01/26 03:55 | Thanapet Chanta v Keisuke Saitoh | 4-6,6-2,8-10 |
| ITF M15 Nonthaburi | 2019/12/03 05:30 | Keisuke Saitoh v Makoto Ochi | 2-6,2-6 |
| ITF M15 Nonthaburi | 2019/11/29 03:00 | Duckhee Lee v Keisuke Saitoh | 6-2,6-1 |
| ITF M15 Nonthaburi | 2019/11/28 02:30 | Keisuke Saitoh v Rio Noguchi | 7-5,7-6 |
| ITF M15 Nonthaburi | 2019/11/27 02:30 | Keisuke Saitoh v Ryota Tanuma | 6-2,7-6 |
| ITF M15 Akishima | 2019/06/14 03:15 | Rio Noguchi v Keisuke Saitoh | 6-1,6-1 |