Stadium: Court 3 Round: 27
| 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 | 2018/05/16 06:00 | Takashi Saito v Min-Kyu Song | 6-1,6-0 |
| ITF Vietnam F3 | 2018/05/14 03:00 | Takashi Saito v Matthew Romios | 7-6,6-1 |
| ITF Vietnam F2 | 2018/05/11 03:00 | Rio Noguchi v Takashi Saito | 4-6,7-5,6-3 |
| ITF Vietnam F2 | 2018/05/09 03:00 | Chun Hun Wong v Takashi Saito | 7-6,1-6,5-7 |
| ITF Vietnam F2 | 2018/05/07 03:00 | Takashi Saito v Soichiro Moritani | 7-6,3-6,6-3 |
| ITF Vietnam F1 | 2018/05/04 03:00 | Lucas Vuradin v Takashi Saito | 7-5,6-4 |
| ITF Vietnam F1 | 2018/05/02 04:55 | Phuong Van Nguyen v Takashi Saito | 1-6,4-6 |
| ITF Vietnam F1 | 2018/05/01 03:00 | Rhett Purcell v Takashi Saito | 6-7,1-6 |