Stadium: Court 17 Round: 25 Ground: Hardcourt outdoor
| Challenger Ho Chi Minh City Qual | 2016/10/10 04:45 | Shuichi Sekiguchi v Yunseong Chung | 6-4,4-6,6-4 |
| Challenger Chengdu Qual | 2017/07/30 03:00 | Vishnu Vardhan v Yunseong Chung | 4-6,3-6 |
| Challenger Chengdu Qual | 2017/07/29 03:55 | Sergey Betov v Yunseong Chung | 2-6,6-7 |
| ITF China F14 | 2017/07/25 03:35 | Yunseong Chung v Jie Cui | 3-6,5-7 |
| ITF China F13 | 2017/07/20 02:00 | Jui-Chen Hung v Yunseong Chung | 1-6,6-3,6-4 |
| ITF China F13 | 2017/07/18 05:35 | He Feng v Yunseong Chung | 4-6,4-6 |
| ITF Korea F5 | 2017/06/29 01:30 | Yunseong Chung v Tae-Woo Lee | 5-7,6-7 |
| ITF Korea F5 | 2017/06/28 06:50 | Yunseong Chung v A-Ram Kim | 6-1,6-2 |
| ITF Korea F4 | 2017/06/23 03:30 | Yunseong Chung v Cheong-Eui Kim | 5-7,6-7 |
| ITF China F14 | 2017/07/29 04:50 | Nikola Milojevic v Shuichi Sekiguchi | 6-4,6-0 |
| ITF China F14 | 2017/07/28 03:00 | Shuichi Sekiguchi v Karunuday Singh | 6-3,7-6 |
| ITF China F14 | 2017/07/26 02:00 | Shuichi Sekiguchi v Zhaoyi Cao | 6-4,6-2 |
| Challenger Astana | 2017/07/20 07:40 | Shuichi Sekiguchi v Alexander Bublik | 3-6,5-7 |
| Challenger Astana | 2017/07/18 05:00 | Dzmitry Zhyrmont v Shuichi Sekiguchi | 2-6,6-1,3-6 |
| Challenger Fergana | 2017/06/21 06:30 | Ilya Ivashka v Shuichi Sekiguchi | 6-2,6-2 |
| Challenger Fergana | 2017/06/19 06:00 | Shuichi Sekiguchi v Vladyslav Manafov | 6-4,3-6,7-5 |
| ITF Chinese Taipei F1 | 2017/06/13 03:25 | Tung-Lin Wu v Shuichi Sekiguchi | 6-4,6-2 |