Stadium: Court 1 Round: 46
| ITF Thailand F9 | 2015/06/19 03:00 | Toshihide Matsui v Sekiguchi, Shuichi | 4-6,4-6 |
| Challenger Taipei Qual | 2018/04/07 07:05 | Toshihide Matsui v Cing-Yang Meng | 6-3,6-4 |
| ITF Japan F5 | 2018/04/03 04:40 | Toshihide Matsui v Sora Fukuda | 4-6,6-4,4-6 |
| Shenzhen, China, Qualifying | 2018/03/11 03:10 | Toshihide Matsui v Renta Tokuda | 2-6,3-6 |
| Australian Open WC Qual | 2017/11/28 03:25 | Zhao, Lingxi v Toshihide Matsui | 6-4,7-5 |
| Challenger Toyota Qual | 2017/11/12 07:05 | Ehara, Hiroyasu v Toshihide Matsui | 6-4,7-6 |
| Challenger Toyota Qual | 2017/11/11 08:00 | Toshihide Matsui v Makoto Ochi | 6-4,7-6 |
| Challenger Toyota Qual | 2017/11/11 04:10 | Kazuki Nishiwaki v Toshihide Matsui | 3-6,4-6 |
| Challenger Suzhou Qual | 2017/10/22 04:00 | Sidharth Rawat v Toshihide Matsui | 6-3,6-4 |
| Challenger Taipei Qual | 2018/04/07 08:20 | Vishnu Vardhan v Sekiguchi, Shuichi | 4-6,5-7 |
| ITF Japan F4 | 2018/03/27 01:00 | Grills, Jacob v Sekiguchi, Shuichi | 7-6,4-6,6-3 |
| ITF Japan F3 | 2018/03/22 04:05 | Sekiguchi, Shuichi v Katayama, Sho | 5-7,6-4,2-6 |
| ITF Japan F3 | 2018/03/19 01:00 | Sekiguchi, Shuichi v Jumpei Yamasaki | 6-7,7-6,6-2 |
| ITF Japan F2 | 2018/03/12 02:30 | Hong, Seong Chan v Sekiguchi, Shuichi | 6-4,1-6,7-6 |
| Yokohama, Japan, Qualifying | 2018/02/24 05:10 | Hiroki Moriya v Sekiguchi, Shuichi | 6-2,6-4 |
| Challenger Kyoto Qual | 2018/02/17 06:10 | Kibi, Yuya v Sekiguchi, Shuichi | 6-3,6-2 |
| Ningbo, China, Qualifying | 2017/10/15 07:50 | Sekiguchi, Shuichi v Yunseong Chung | 4-6,3-6 |