Stadium: Show Court 1 Round: 25 Ground: Hardcourt outdoor
| ITF M15 Kashiwa | 2019/04/03 06:15 | Jumpei Yamasaki v Ji Sung Nam | 6-3,2-6,7-6 |
| ITF M15 Nishi-Tama | 2019/03/09 01:00 | Jumpei Yamasaki v Ji Sung Nam | 2-6,1-6 |
| Challenger Chengdu | 2019/08/02 04:00 | Ji Sung Nam v Hyeon Chung | 6-7,6-1,3-6 |
| Challenger Chengdu | 2019/08/01 03:00 | Dayne Kelly v Ji Sung Nam | 6-7,3-6 |
| Challenger Chengdu | 2019/07/31 03:50 | Mao-Xin Gong v Ji Sung Nam | 6-7,1-6 |
| Challenger Nur-Sultan | 2019/07/18 06:50 | Evgeny Donskoy v Ji Sung Nam | 3-6,6-1,6-4 |
| Challenger Nur-Sultan | 2019/07/16 08:25 | Teymuraz Gabashvili v Ji Sung Nam | 6-1,4-6,2-6 |
| ITF M15 Almaty | 2019/07/12 04:00 | Ji Sung Nam v Andrey Golubev | 3-6,3-6 |
| ITF M15 Almaty | 2019/07/11 04:00 | Ji Sung Nam v Sagadat Ayap | 6-1,3-6,6-1 |
| ITF M15 Almaty | 2019/07/09 07:30 | Ji Sung Nam v Sultan Narbekov | 6-1,6-1 |
| Challenger Yokkaichi | 2019/08/05 01:30 | Jumpei Yamasaki v Blake Ellis | 6-4,6-4 |
| ITF M25 Taipei | 2019/07/25 04:30 | Yusuke Takahashi v Jumpei Yamasaki | 6-2,6-2 |
| ITF M25 Taipei | 2019/07/23 02:00 | Jumpei Yamasaki v Rhett Purcell | 3-6,6-1,6-2 |
| ITF M25 Taipei | 2019/07/17 02:00 | Jumpei Yamasaki v Kousuke Ogura | 6-2,3-6,4-6 |
| ITF M25 Qujing | 2019/07/13 02:30 | Jumpei Yamasaki v Yan Bai | 0-6,5-7 |
| ITF M25 Qujing | 2019/07/12 03:25 | Rio Noguchi v Jumpei Yamasaki | 3-6,2-6 |
| ITF M25 Qujing | 2019/07/11 03:50 | Jumpei Yamasaki v Makoto Ochi | 2-6,6-3,7-6 |
| ITF M25 Qujing | 2019/07/10 04:00 | Rui-Xuan Wang v Jumpei Yamasaki | 4-6,2-6 |