Stadium: Court 10 Round: 29 Ground: Hardcourt outdoor
| ITF M15 - Kashiwa | 2019/04/03 05:20 | Takuto Niki v Shuichi Sekiguchi | 2-6,6-3,7-6 |
| ITF M15 - Nishi-Tokyo | 2019/03/16 01:00 | Takuto Niki v Shuichi Sekiguchi | 4-6,7-6,3-6 |
| ITF M25 - Matsuyama | 2019/04/13 03:00 | Takuto Niki v Wishaya Trongcharoenchaikul | 7-5,6-3 |
| ITF M25 - Matsuyama | 2019/04/12 04:00 | Gage Brymer v Takuto Niki | 4-6,5-7 |
| ITF M25 - Matsuyama | 2019/04/12 01:00 | Takuto Niki v Yuki Mochizuki | 6-2,6-3 |
| ITF M25 - Matsuyama | 2019/04/10 03:30 | Takuto Niki v Sho Katayama | 6-2,6-3 |
| ITF M15 - Kashiwa | 2019/04/04 02:35 | Yunosuke Tanaka v Takuto Niki | 7-6,1-6,6-1 |
| ITF M15 - Kashiwa | 2019/04/03 05:20 | Takuto Niki v Shuichi Sekiguchi | 2-6,6-3,7-6 |
| ITF M15 - Tsukuba | 2019/03/28 02:10 | Ryohei Tagata v Takuto Niki | 3-6,6-2,7-5 |
| ITF M15 - Tsukuba | 2019/03/27 01:00 | Takuto Niki v Takashi Saito | 6-4,6-2 |
| ITF M25 - Matsuyama | 2019/04/13 01:00 | Seong Chan Hong v Shuichi Sekiguchi | 2-6,3-6 |
| ITF M25 - Matsuyama | 2019/04/12 05:20 | Naoki Tajima v Shuichi Sekiguchi | 4-6,4-6 |
| ITF M25 - Matsuyama | 2019/04/12 02:25 | Issei Okamura v Shuichi Sekiguchi | 1-6,0-6 |
| ITF M25 - Matsuyama | 2019/04/09 04:10 | Ryota Tanuma v Shuichi Sekiguchi | 4-6,4-6 |
| ITF M15 - Kashiwa | 2019/04/03 05:20 | Takuto Niki v Shuichi Sekiguchi | 2-6,6-3,7-6 |
| ITF M15 - Nishi-Tokyo | 2019/03/17 02:00 | Shuichi Sekiguchi v Seong Chan Hong | 6-7,4-6 |
| ITF M15 - Nishi-Tokyo | 2019/03/16 01:00 | Takuto Niki v Shuichi Sekiguchi | 4-6,7-6,3-6 |
| ITF M15 - Nishi-Tokyo | 2019/03/15 01:00 | Shuichi Sekiguchi v Shintaro Imai | 6-3,6-0 |