Stadium: Court 2 Round: 45 Ground: Hardcourt outdoor
| ITF M15 Kofu | 2019/03/18 03:00 | Quentin Folliot v Keigo Shimizu | 2-6,1-6 |
| ITF M15 Nishi-Tama | 2019/03/05 03:30 | Hiroyasu Ehara v Keigo Shimizu | 6-1,6-0 |
| ITF Japan F1 | 2018/03/03 03:00 | Naru Shirafuji v Keigo Shimizu | 6-2,6-1 |
| ITF Japan F6 Qual | 2017/05/27 01:00 | Yuki Matsuo v Keigo Shimizu | 7-6,5-7,6-1 |
| ITF Japan F3 | 2017/03/18 06:00 | Collin Johns v Keigo Shimizu | 6-4,6-1 |
| ITF Japan F1 | 2017/03/05 01:00 | Yuki Mochizuki v Keigo Shimizu | 6-2,6-1 |
| ITF M15 Kofu | 2019/03/18 03:00 | Seita Watanabe v Shao-Fan Liu | 6-3,4-6,11-9 |
| ITF M15 Nishi-Tokyo | 2019/03/12 05:00 | Makoto Ochi v Seita Watanabe | 6-1,6-2 |
| Challenger Kobe | 2018/11/11 06:10 | Blake Ellis v Seita Watanabe | 6-4,6-2 |
| Challenger Kobe | 2018/11/10 07:20 | Seita Watanabe v Takashi Saito | 4-6,7-5,7-6 |
| ITF Japan F8 | 2018/06/09 01:00 | Seita Watanabe v Tomohiro Masabayashi | 7-6,5-7,4-6 |
| Challenger Kobe Qual | 2017/11/04 07:45 | Seita Watanabe v Xin Gao | 6-4,4-6,0-6 |