Stadium: Central Court Round: 25 Ground: Clay
| Challenger Nanchang Qual | 2018/04/15 03:00 | Shuichi Sekiguchi v Yuanfeng Li | 6-3,6-1 |
| Challenger Taipei | 2018/04/11 06:35 | Shuichi Sekiguchi v Dudi Sela | 4-6,2-6 |
| Challenger Taipei Qual | 2018/04/08 07:25 | Toshihide Matsui v Shuichi Sekiguchi | 5-7,6-7 |
| Challenger Taipei Qual | 2018/04/07 08:20 | Vishnu Vardhan v Shuichi Sekiguchi | 4-6,5-7 |
| ITF Japan F4 | 2018/03/27 01:00 | Jacob Grills v Shuichi Sekiguchi | 7-6,4-6,6-3 |
| ITF Japan F3 | 2018/03/22 04:05 | Shuichi Sekiguchi v Sho Katayama | 5-7,6-4,2-6 |
| ITF Japan F3 | 2018/03/19 01:00 | Shuichi Sekiguchi v Jumpei Yamasaki | 6-7,7-6,6-2 |
| ITF Japan F2 | 2018/03/12 02:30 | Seong Chan Hong v Shuichi Sekiguchi | 6-4,1-6,7-6 |
| Davis Cup | 2018/04/06 04:00 | Ze Zhang v Sumit Nagal | 6-4,6-1 |
| Challenger Qujing | 2018/03/22 04:45 | Ze Zhang v Ilya Ivashka | 3-6,6-3,3-6 |
| Challenger Qujing | 2018/03/20 06:50 | Ze Zhang v Luke Saville | 7-5,7-6 |
| Challenger Shenzhen | 2018/03/18 05:45 | Ze Zhang v Ilya Ivashka | 4-6,2-6 |
| Challenger Shenzhen | 2018/03/17 04:35 | Hubert Hurkacz v Ze Zhang | 6-7,6-2,2-6 |
| Challenger Shenzhen | 2018/03/16 07:20 | Viktor Galovic v Ze Zhang | 4-6,7-6,3-6 |
| Challenger Shenzhen | 2018/03/15 08:30 | Ze Zhang v Oscar Otte | 6-1,7-5 |
| Challenger Shenzhen | 2018/03/13 05:05 | Jaume Munar v Ze Zhang | 6-3,4-6,2-6 |