Stadium: Court 7 Round: 25 Ground: Hardcourt outdoor
| ITF M15 Tsukuba | 2019/03/27 01:00 | Takuto Niki v Takashi Saito | 6-4,6-2 |
| ITF - M25 - Hongkong | 2019/01/03 02:00 | Takashi Saito v Julian Lenz | 3-6,1-6 |
| ITF - M25 - Hongkong | 2019/01/02 02:00 | Benjamin Hassan v Takashi Saito | 1-6,4-6 |
| ITF - M25 - Hongkong | 2019/01/01 02:00 | Takashi Saito v William Ma | 6-0,6-3 |
| ITF Hong Kong F3 | 2018/12/25 05:20 | Runhao Hua v Takashi Saito | 6-4,3-6,6-3 |
| Challenger Kobe | 2018/11/10 07:20 | Seita Watanabe v Takashi Saito | 4-6,7-5,7-6 |
| ITF Thailand F8 | 2018/11/08 02:00 | Antoine Bellier v Takashi Saito | 6-1,6-1 |
| ITF Thailand F8 | 2018/11/07 02:00 | Jirat Navasirisomboon v Takashi Saito | 0-6,0-6 |
| 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 |