| ITF Thailand F9 | 2015/04/27 03:00 | Gengo Kikuchi v Ji Sung Nam | 6-4,6-7,6-3 |
| ITF Vietnam F2 | 2018/05/11 03:00 | Gengo Kikuchi v Ryota Tanuma | 6-4,6-2 |
| ITF Vietnam F2 | 2018/05/08 03:00 | Gengo Kikuchi v Pak Long Yeung | 4-6,7-5,6-2 |
| ITF Vietnam F2 | 2018/05/06 04:00 | Gengo Kikuchi v Niki Kaliyanda Poonacha | 6-1,6-1 |
| ITF Vietnam F2 | 2018/05/05 03:00 | Gengo Kikuchi v Yuichiro Inui | 6-4,6-4 |
| ITF Vietnam F1 | 2018/04/30 03:00 | Gengo Kikuchi v Chun Hsin Tseng | 2-6,7-6,4-6 |
| ITF Japan F5 | 2018/04/01 00:30 | Gengo Kikuchi v Shao-Fan Liu | 6-2,6-7,3-6 |
| ITF Japan F5 | 2018/03/31 00:30 | Gengo Kikuchi v Daisuke Sumizawa | 6-1,6-3 |
| ITF Japan F3 | 2018/03/20 06:00 | Tung-Lin Wu v Gengo Kikuchi | 6-2,6-3 |
| 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 |
| ITF Vietnam F2 | 2018/05/06 04:00 | Ji Sung Nam v Stefan Skadarka | 6-0,6-4 |
| ITF Vietnam F2 | 2018/05/05 07:00 | Ji Sung Nam v Phongsapak Kerdlaphee | 6-2,6-1 |
| Challenger Seoul Qual | 2018/04/30 03:00 | Yosuke Watanuki v Ji Sung Nam | 7-5,6-2 |
| Challenger Seoul Qual | 2018/04/29 03:35 | Ji Sung Nam v Blake Ellis | 6-3,6-3 |
| Challenger Seoul Qual | 2018/04/28 01:30 | Daniel Yoo v Ji Sung Nam | 2-6,2-6 |