Stadium: Court 2 Round: 26 Ground: Hardcourt outdoor
| ITF Thailand F12 Qual | 2017/12/10 03:00 | Ryota Tanuma v Ji Sung Nam | 4-6,2-6 |
| Challenger Gwangju | 2019/05/14 06:00 | Ji Sung Nam v Yuichi Sugita | 2-6,2-6 |
| Challenger Gwangju | 2019/05/13 02:00 | Ji Sung Nam v Rio Noguchi | 6-2,6-1 |
| Challenger Busan | 2019/05/06 07:40 | Cem Ilkel v Ji Sung Nam | 6-4,7-6 |
| Challenger Seoul | 2019/05/01 02:00 | Ji Sung Nam v Ramkumar Ramanathan | 3-6,6-7 |
| Challenger Seoul | 2019/04/30 03:35 | Ji Sung Nam v Duckhee Lee | 7-5,6-1 |
| Challenger Seoul | 2019/04/29 02:00 | Ji Sung Nam v Ji Hoon Son | 6-3,6-2 |
| ITF M25 Matsuyama | 2019/04/12 01:00 | Ji Sung Nam v Gage Brymer | 3-6,3-6 |
| ITF M25 Matsuyama | 2019/04/09 04:55 | Ji Sung Nam v Mark Whitehouse | 7-6,6-2 |
| ITF - Nonthaburi M25 | 2019/05/22 03:00 | Ryota Tanuma v Anton Chekhov | 3-6,7-6,6-3 |
| ITF - Luan M25 | 2019/05/16 03:30 | Ryota Tanuma v Fajing Sun | 5-7,3-6 |
| ITF - Luan M25 | 2019/05/15 04:50 | Linang Xiao v Ryota Tanuma | 4-6,4-6 |
| ITF M25 Wuhan | 2019/05/08 03:15 | Ryota Tanuma v Yecong He | 4-6,6-3,3-6 |
| ITF M25 Matsuyama | 2019/04/09 04:10 | Ryota Tanuma v Shuichi Sekiguchi | 4-6,4-6 |
| ITF - Kashiwa M15 | 2019/04/01 00:00 | Ryota Tanuma v Seita Watanabe | 3-6,6-1,12-10 |
| ITF - Kashiwa M15 | 2019/04/01 00:00 | Ryota Tanuma v Tamaki Yamao | 6-7,4-6 |
| ITF - Tsukuba M15 | 2019/03/28 01:00 | Ryota Tanuma v Shintaro Imai | 5-7,3-6 |