Stadium: Court 3 Round: 27
| ITF Vietnam F3 | 2018/05/16 03:00 | Son, Ji Hoon v Kushnirovich, Gary | 4-6,7-6,6-1 |
| ITF Vietnam F3 | 2018/05/15 03:00 | Nam Hoang Ly v Son, Ji Hoon | 1-6,4-6 |
| ITF Vietnam F2 | 2018/05/08 03:00 | Nam Hoang Ly v Son, Ji Hoon | 3-6,7-5,6-0 |
| ITF Vietnam F2 | 2018/05/06 04:00 | Son, Ji Hoon v Noh, Sang-Woo | 6-2,6-1 |
| Challenger Seoul | 2018/05/03 08:30 | Jordan Thompson v Son, Ji Hoon | 7-5,7-6 |
| Challenger Seoul Qual | 2018/04/30 03:00 | Wishaya Trongcharoenchaikul v Son, Ji Hoon | 6-7,4-6 |
| Challenger Seoul Qual | 2018/04/29 02:00 | Son, Ji Hoon v Sekiguchi, Shuichi | 6-2,7-6 |
| Challenger Seoul Qual | 2018/04/28 02:50 | Son, Ji Hoon v Oh, Seong-Gook | 6-3,6-3 |
| ITF Vietnam F3 | 2018/05/16 06:00 | Saito, Takashi v Song, Min-Kyu | 6-1,6-0 |
| ITF Vietnam F3 | 2018/05/14 03:00 | Saito, Takashi v Romios, Matthew Christopher | 7-6,6-1 |
| ITF Vietnam F2 | 2018/05/11 03:00 | Rio Noguchi v Saito, Takashi | 4-6,7-5,6-3 |
| ITF Vietnam F2 | 2018/05/09 03:00 | Wong, Chun Hun v Saito, Takashi | 7-6,1-6,5-7 |
| ITF Vietnam F2 | 2018/05/07 03:00 | Saito, Takashi v Moritani, Soichiro | 7-6,3-6,6-3 |
| ITF Vietnam F1 | 2018/05/04 03:00 | Vuradin, Lucas v Saito, Takashi | 7-5,6-4 |
| ITF Vietnam F1 | 2018/05/02 04:55 | Nguyen, Phuong van v Saito, Takashi | 1-6,4-6 |
| ITF Vietnam F1 | 2018/05/01 03:00 | Purcell, Rhett v Saito, Takashi | 6-7,1-6 |