| ITF Turkey F5 | 2018/02/06 08:30 | Ji Hoon Son v Ji Sung Nam | 4-6,7-6,6-1 |
| ITF Vietnam F3 | 2018/05/16 03:00 | Ji Hoon Son v Gary Kushnirovich | 4-6,7-6,6-1 |
| ITF Vietnam F3 | 2018/05/15 03:00 | Nam Hoang Ly v Ji Hoon Son | 1-6,4-6 |
| ITF Vietnam F2 | 2018/05/08 03:00 | Nam Hoang Ly v Ji Hoon Son | 3-6,7-5,6-0 |
| ITF Vietnam F2 | 2018/05/06 04:00 | Ji Hoon Son v Sang-Woo Noh | 6-2,6-1 |
| Challenger Seoul | 2018/05/03 08:30 | Jordan Thompson v Ji Hoon Son | 7-5,7-6 |
| Challenger Seoul Qual | 2018/04/30 03:00 | Wishaya Trongcharoenchaikul v Ji Hoon Son | 6-7,4-6 |
| Challenger Seoul Qual | 2018/04/29 02:00 | Ji Hoon Son v Shuichi Sekiguchi | 6-2,7-6 |
| Challenger Seoul Qual | 2018/04/28 02:50 | Ji Hoon Son v Seong-Gook Oh | 6-3,6-3 |
| ITF Vietnam F3 | 2018/05/17 03:00 | Ji Sung Nam v Abhinav Sanjeev Shanmugam | 7-6,6-2 |
| ITF Vietnam F3 | 2018/05/16 05:30 | Rio Noguchi v Ji Sung Nam | 3-6,1-6 |
| ITF Vietnam F3 | 2018/05/15 04:55 | Nicholas Bybel v Ji Sung Nam | 4-6,2-6 |
| ITF Vietnam F2 | 2018/05/13 04:00 | Rio Noguchi v Ji Sung Nam | 7-6,6-3 |
| ITF Vietnam F2 | 2018/05/12 04:45 | Gengo Kikuchi v Ji Sung Nam | 4-6,3-6 |
| ITF Vietnam F2 | 2018/05/11 03:00 | Kelsey Stevenson v Ji Sung Nam | 6-4,2-6,1-6 |
| ITF Vietnam F2 | 2018/05/09 05:50 | Phuong Van Nguyen v Ji Sung Nam | 4-6,2-6 |
| ITF Vietnam F2 | 2018/05/07 05:45 | Ji Sung Nam v Karunuday Singh | 6-4,6-3 |