Stadium: Court F Round: 28 Ground: Hardcourt outdoor
| ITF M15 Nishi-Tama | 2019/03/08 06:50 | Seong Chan Hong v Jumpei Yamasaki | 6-3,6-7,2-6 |
| ITF M15 Nishi-Tama | 2019/03/08 02:30 | Gengo Kikuchi v Jumpei Yamasaki | 6-7,6-4,3-6 |
| ITF M15 Nishi-Tama | 2019/03/06 02:30 | Jumpei Yamasaki v Blake Ellis | 7-5,6-4 |
| ITF M15 Claremont | 2019/02/07 18:00 | Jenson Brooksby v Jumpei Yamasaki | 6-2,6-1 |
| ITF M15 Claremont | 2019/02/06 18:00 | Dusty H. Boyer v Jumpei Yamasaki | 6-4,3-6,6-7 |
| ITF M25 Weston | 2019/01/29 18:20 | Jumpei Yamasaki v Patrick Kypson | 2-6,3-6 |
| ITF M25 Palm Coast | 2019/01/23 18:05 | Matic Spec v Jumpei Yamasaki | 6-3,7-6 |
| ITF M25 Hong Kong | 2019/01/04 04:20 | Jumpei Yamasaki v Evan Furness | 0-6,4-6 |
| ITF M15 Nishi-Tama | 2019/03/08 06:25 | Hiroyasu Ehara v Ji Sung Nam | 4-6,2-6 |
| ITF M15 Nishi-Tama | 2019/03/06 04:00 | Takuto Niki v Ji Sung Nam | 4-6,2-6 |
| Challenger Da Nang | 2019/01/06 08:35 | Ji Sung Nam v N.Sriram Balaji | 6-7,6-7 |
| Challenger Kobe | 2018/11/12 06:35 | Nam Hoang Ly v Ji Sung Nam | 6-7,7-6,6-2 |
| Challenger Shenzhen 2 | 2018/10/28 02:30 | Yaraslav Shyla v Ji Sung Nam | 7-6,2-6,6-3 |
| Challenger Shenzhen 2 | 2018/10/27 02:00 | Yuanfeng Li v Ji Sung Nam | 4-6,1-6 |
| Challenger Liuzhou | 2018/10/20 04:30 | Yecong He v Ji Sung Nam | 2-6,6-3,6-2 |
| ITF Korea F5 | 2018/08/26 03:00 | Ji Sung Nam v Makoto Ochi | 6-4,6-1 |