| ITF Indonesia F2 | 04/10 06:30 | - | Patrombon, Jeson v Sekiguchi, Shuichi | 2-6,0-6 | |
| ITF Indonesia F2 | 04/09 06:15 | - | Bisht, Ronit Singh v Sekiguchi, Shuichi | Retired | |
| ITF Indonesia F2 | 04/08 07:40 | - | Cortes Alcaraz, Aaron v Sekiguchi, Shuichi | 2-6,2-6 | |
| ITF Japan F4 | 04/02 01:00 | - | Li, Zhe v Sekiguchi, Shuichi | 6-4,2-6,6-2 | |
| ITF Japan F4 | 04/01 01:00 | - | Ryotaro Matsumura v Sekiguchi, Shuichi | 2-6,4-6 | |
| ITF Japan F4 | 03/30 05:00 | - | Onozawa, Arata v Sekiguchi, Shuichi | 4-6,4-6 | |
| ITF Japan F3 | 03/27 03:25 | - | Wu, Di v Sekiguchi, Shuichi | 1-6,7-5,6-2 | |
| ITF Japan F3 | 03/26 01:00 | - | Saito, Takashi v Sekiguchi, Shuichi | 3-6,6-7 | |
| ITF Japan F3 | 03/24 02:10 | - | Watanuki, Yusuke v Sekiguchi, Shuichi | 1-6,3-6 | |
| ITF Turkey F2 | 01/17 07:00 | - | Jose Pereira v Sekiguchi, Shuichi | 6-3,7-5 | |
| ITF Turkey F1 | 01/11 09:00 | - | Sekiguchi, Shuichi v Hugo Nys | 6-7,6-4,6-3 | |
| ITF Turkey F1 | 01/10 08:00 | - | Alexey Vatutin v Sekiguchi, Shuichi | 4-6,6-2,5-7 | |
| ITF Turkey F1 | 01/09 08:00 | - | Jose Pereira v Sekiguchi, Shuichi | 4-6,6-3,3-6 | |
| ITF Turkey F1 | 01/08 08:00 | - | Uzhylovsky, Vladimir v Sekiguchi, Shuichi | 3-6,5-7 | |
| ITF Thailand F10 | 12/03 07:05 | - | Burapharitta, Phassawit v Sekiguchi, Shuichi | 6-3,6-4 | |
| ITF Thailand F10 | 12/01 03:00 | - | Congsup Congcar v Sekiguchi, Shuichi | 0-6,3-6 | |
| ITF Thailand F10 | 11/26 06:55 | - | Sekiguchi, Shuichi v Yasutaka Uchiyama | 6-4,5-7,2-6 | |
| ITF Thailand F10 | 11/25 07:55 | - | Wattanakul, Pol v Sekiguchi, Shuichi | Retired | |
| Challenger Kaohsiung | 07/15 08:00 | 25 | Sekiguchi, Shuichi v Huang, Liang-Chi | 0-6,1-6 | |
| Challenger - Shenzhen | 04/22 02:00 | 25 | Sekiguchi, Shuichi v Yasutaka Uchiyama | 5-7,6-7 | |
| Shenzhen, China, Qualifying | 04/21 02:00 | 44 | Sekiguchi, Shuichi v Baluda, Victor | 6-3,6-0 | |
| ITF China F5 | 04/17 06:45 | - | Wang, Chuhan v Sekiguchi, Shuichi | 6-4,7-6 | |
| ITF China F5 | 04/16 02:00 | - | Ito, Yuichi v Sekiguchi, Shuichi | 3-6,4-6 | |
| ITF Japan F2 | 03/22 02:00 | - | Kibi, Yuya v Sekiguchi, Shuichi | 4-6,0-6 | |
| ITF Japan F2 | 03/21 01:30 | - | Takeuchi, Kento (1987) v Sekiguchi, Shuichi | 1-6,3-6 | |
| ITF Japan F2 | 03/19 01:00 | - | Shiga, Masato v Sekiguchi, Shuichi | 3-6,2-6 | |
| ITF Japan F2 | 03/17 02:50 | - | Hung, Jui-Chen v Sekiguchi, Shuichi | 3-6,6-4,4-6 | |
| ITF Japan F1 | 03/12 01:00 | - | Takeuchi, Kento (1987) v Sekiguchi, Shuichi | Retired |