Stadium: Court 2 Round: 26 Ground: Hardcourt outdoor
| ITF Thailand F9 | 2015/06/26 03:00 | Shuichi Sekiguchi v Jung-Woong Na | 6-4,6-3 |
| ITF M25 Nonthaburi | 2020/01/29 02:30 | Jung-Woong Na v Wishaya Trongcharoenchaikul | 7-6,7-6 |
| ITF M25 Nonthaburi | 2020/01/28 03:55 | Jirat Navasirisomboon v Jung-Woong Na | 6-2,2-6,3-10 |
| ITF M25 Nonthaburi | 2020/01/27 05:30 | Soichiro Moritani v Jung-Woong Na | 3-6,3-6 |
| ITF M25 Nonthaburi | 2020/01/26 09:20 | Jung-Woong Na v Runhao Hua | 2-6,7-6,10-5 |
| ITF M15 Changwon | 2019/10/18 01:00 | Yuta Shimizu v Jung-Woong Na | 6-3,7-5 |
| ITF M15 Changwon | 2019/10/17 03:35 | Minjong Park v Jung-Woong Na | 6-1,0-6,4-6 |
| ITF M15 Changwon | 2019/10/16 00:55 | Young Seok Lee v Jung-Woong Na | 2-6,1-6 |
| ITF M15 Anseong | 2019/06/28 03:00 | Jung-Woong Na v Cheong-Eui Kim | 2-6,2-6 |
| ITF M25 Nonthaburi | 2020/01/29 07:25 | Kasidit Samrej v Shuichi Sekiguchi | 3-6,2-6 |
| Challenger Bangkok 2 | 2020/01/22 05:25 | Peter Polansky v Shuichi Sekiguchi | 6-3,7-5 |
| ATP Auckland | 2020/01/10 22:00 | Shuichi Sekiguchi v Tatsuma Ito | 3-6,6-4,4-6 |
| ITF M15 Te Anau | 2020/01/04 00:30 | Luke Saville v Shuichi Sekiguchi | 6-3,6-3 |
| ITF M15 Te Anau | 2020/01/02 21:00 | George Stoupe v Shuichi Sekiguchi | 3-6,1-6 |
| ITF M15 Te Anau | 2020/01/01 22:00 | Calum Puttergill v Shuichi Sekiguchi | 6-2,2-6,2-6 |
| ITF M15 Te Anau | 2019/12/31 05:15 | Sam Ryan Ziegann v Shuichi Sekiguchi | 2-6,3-6 |
| Challenger Pune | 2019/11/14 06:30 | Shuichi Sekiguchi v Roberto Ortega-Olmedo | 2-6,4-6 |