Stadium: Court 4 Round: 26 Ground: Hardcourt outdoor
| ITF Japan F1 | 2016/03/10 04:25 | Sekiguchi, Shuichi v Katayama, Sho | 7-5,7-6 |
| 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 |
| Challenger Kaohsiung | 2017/10/03 05:40 | Sekiguchi, Shuichi v Akira Santillan | 3-6,4-6 |
| Challenger - Gwangju | 2017/09/19 01:30 | Sekiguchi, Shuichi v Yang, Tsung-Hua | 5-7,6-7 |
| Challenger Shanghai | 2017/09/12 06:35 | Kudryavtsev, Alexander v Sekiguchi, Shuichi | 6-4,4-6,2-6 |
| ITF Japan F3 | 2018/03/19 01:00 | Katayama, Sho v Moritani, Soichiro | 6-2,6-0 |
| ITF Japan F2 | 2018/03/13 03:00 | Kaichi Uchida v Katayama, Sho | 7-6,6-3 |
| ITF Japan F1 | 2018/03/08 01:30 | Katayama, Sho v Yuta Shimizu | 4-6,1-6 |
| ITF Japan F1 | 2018/03/06 02:00 | Shintaro Imai v Katayama, Sho | 2-6,5-7 |
| Yokohama, Japan, Qualifying | 2018/02/25 02:20 | Hiroki Moriya v Katayama, Sho | 6-3,6-0 |
| Yokohama, Japan, Qualifying | 2018/02/24 06:45 | Przysiezny, Michal v Katayama, Sho | 4-6,6-2,2-6 |
| Challenger Kyoto Qual | 2018/02/17 05:40 | Luke Saville v Katayama, Sho | 6-3,6-3 |
| ITF Vietnam F3 | 2017/11/22 03:00 | Katayama, Sho v Duldaev, Daniyar | 3-6,1-6 |