| ITF M25 Nonthaburi | 05/23 06:45 | 26 | Shuichi Sekiguchi v Jayden Court | 6-4,6-1 | |
| ITF M25 Nonthaburi | 05/21 09:55 | 25 | [422] Shuichi Sekiguchi v Sonchat Ratiwatana [216] | 7-5,6-0 | |
| ITF M25 Wuhan | 05/12 02:00 | 29 | [385] Yan Bai v Shuichi Sekiguchi [411] | 6-2,6-4 | |
| ITF M25 Wuhan | 05/11 02:00 | 28 | [411] Shuichi Sekiguchi v Wishaya Trongcharoenchaikul [490] | 7-6,7-5 | |
| ITF M25 Wuhan | 05/10 03:20 | 27 | Tyler Lu v Shuichi Sekiguchi | 1-6,0-6 | |
| ITF M25 Wuhan | 05/09 04:05 | 26 | Hong Kit Wong v Shuichi Sekiguchi | 2-6,3-6 | |
| ITF M25 Wuhan | 05/08 05:40 | 25 | Sora Fukuda v Shuichi Sekiguchi | Retired | |
| ITF M15 Wuhan | 05/05 02:00 | 29 | Shuichi Sekiguchi v Sho Shimabukuro | 6-3,6-0 | |
| ITF M15 Wuhan | 05/04 02:00 | 28 | Shuichi Sekiguchi v Kuan-Yi Lee | 6-3,6-3 | |
| ITF M15 Wuhan | 05/03 02:00 | 27 | [411] Shuichi Sekiguchi v Ti Chen [315] | Walkover | |
| ITF M15 Wuhan | 05/02 04:50 | 26 | Shuichi Sekiguchi v Alexander Crnokrak | 7-5,6-2 | |
| ITF M15 Wuhan | 05/01 05:50 | 25 | Shuichi Sekiguchi v Chenhe Li | 6-4,6-3 | |
| ITF M25 Matsuyama | 04/14 04:15 | 29 | [494] Takuto Niki v Shuichi Sekiguchi [398] | 4-6,4-6 | |
| ITF M25 Matsuyama | 04/13 01:00 | 28 | Seong Chan Hong v Shuichi Sekiguchi | 2-6,3-6 | |
| ITF M25 Matsuyama | 04/12 05:20 | 27 | Naoki Tajima v Shuichi Sekiguchi | 4-6,4-6 | |
| ITF M25 Matsuyama | 04/12 02:25 | 26 | Issei Okamura v Shuichi Sekiguchi | 1-6,0-6 | |
| ITF M25 Matsuyama | 04/09 04:10 | 25 | Ryota Tanuma v Shuichi Sekiguchi | 4-6,4-6 | |
| ITF M15 Kashiwa | 04/03 05:20 | 25 | [493] Takuto Niki v Shuichi Sekiguchi [398] | 2-6,6-3,7-6 | |
| ITF M15 Nishi-Tokyo | 03/17 02:00 | 29 | Shuichi Sekiguchi v Seong Chan Hong | 6-7,4-6 | |
| ITF M15 Nishi-Tokyo | 03/16 01:00 | 28 | [497] Takuto Niki v Shuichi Sekiguchi [399] | 4-6,7-6,3-6 | |
| ITF M15 Nishi-Tokyo | 03/15 01:00 | 27 | [399] Shuichi Sekiguchi v Shintaro Imai [394] | 6-3,6-0 | |
| ITF M15 Nishi-Tokyo | 03/14 03:45 | 26 | Shuichi Sekiguchi v Yuki Mochizuki | 6-2,6-1 | |
| ITF M15 Nishi-Tokyo | 03/13 01:00 | 25 | Shuichi Sekiguchi v Keisuke Saitoh | 6-3,6-2 | |
| ITF M25 Mildura | 03/09 01:00 | 28 | [399] Shuichi Sekiguchi v Brydan Klein [380] | 7-6,1-6,1-6 | |
| ITF M25 Mildura | 03/08 02:40 | 27 | [464] Yuta Shimizu v Shuichi Sekiguchi [399] | 3-6,3-6 | |
| ITF M25 Mildura | 03/07 02:00 | 26 | Issei Okamura v Shuichi Sekiguchi | 3-6,6-3,2-6 | |
| ITF M25 Mildura | 03/05 01:30 | 25 | Alexis Canter v Shuichi Sekiguchi | 6-7,1-6 | |
| ITF M25 Albury | 03/02 00:00 | 28 | [379] Brydan Klein v Shuichi Sekiguchi [397] | 6-3,6-2 | |
| ITF M25 Albury | 02/28 23:30 | 27 | [397] Shuichi Sekiguchi v Thomas Fancutt [495] | 5-7,6-1,6-4 | |
| ITF M25 Albury | 02/28 01:20 | 26 | Shuichi Sekiguchi v Vincent Stouff | 4-6,6-1,6-2 |