Stadium: Court 7 Round: 25 Ground: Hardcourt outdoor
| ITF M15 Daegu | 2019/06/04 02:20 | Seita Watanabe v Seung-Hun Shin | 6-0,6-1 |
| ITF M15 Daegu | 2019/06/03 05:00 | Seita Watanabe v Dae-Hee Lee | 6-2,6-0 |
| ITF M15 Tabarka | 2019/05/16 10:30 | Manuel Guinard v Seita Watanabe | 6-3,6-1 |
| ITF M15 Tabarka | 2019/05/15 08:00 | Seita Watanabe v Roman Blokhin | 6-1,6-0 |
| ITF M15 Tabarka | 2019/05/14 08:00 | Lluis Dolz v Seita Watanabe | 0-6,1-6 |
| ITF M15 Tabarka | 2019/05/07 10:35 | Anis Ghorbel v Seita Watanabe | 6-0,6-4 |
| ITF M15 Tabarka | 2019/05/01 08:30 | Seita Watanabe v Anas Fattar | 4-6,6-7 |
| ITF M15 Tabarka | 2019/04/29 13:30 | Gregorio Cordonnier v Seita Watanabe | 4-6,6-7 |
| ITF M25 Luzhou | 2019/05/30 04:05 | Weiqiang Zheng v Issei Okamura | 2-6,6-2,6-0 |
| ITF M25 Luzhou | 2019/05/29 02:00 | Yu Hsiang Chiu v Issei Okamura | 4-6,1-6 |
| ITF M25 Luan | 2019/05/16 05:05 | Yu Hsiou Hsu v Issei Okamura | 6-3,7-5 |
| ITF M25 Luan | 2019/05/14 05:15 | Hiroyasu Ehara v Issei Okamura | 4-6,2-6 |
| ITF M25 Wuhan | 2019/05/07 04:00 | Issei Okamura v Tsung-Hao Huang | 3-6,6-1,8-10 |
| ITF M25 Wuhan | 2019/05/06 02:00 | Issei Okamura v Bingyu Yu | 6-1,6-2 |
| ITF M25 Matsuyama | 2019/04/12 02:25 | Issei Okamura v Shuichi Sekiguchi | 1-6,0-6 |
| ITF M25 Matsuyama | 2019/04/10 07:00 | Jumpei Yamasaki v Issei Okamura | 6-4,5-7,1-6 |