Stadium: Court 2 Round: 46
| Challenger Seoul Qual | 2018/04/28 03:05 | Jung-Woong Na v Tae-Woo Lee | 6-1,6-3 |
| ITF Turkey F5 | 2018/02/08 07:30 | Jung-Woong Na v Nino Serdarusic | 1-6,2-6 |
| ITF Turkey F5 | 2018/02/06 07:30 | Razvan M Codescu v Jung-Woong Na | 3-6,0-6 |
| ITF Turkey F5 | 2018/02/05 07:30 | Jung-Woong Na v Luka Miklavcic | 6-4,6-0 |
| ITF Turkey F5 | 2018/02/04 07:30 | Jung-Woong Na v Sorin Andrei Iordache | 6-1,7-6 |
| ITF Turkey F4 | 2018/02/01 07:30 | Dragos Dima v Jung-Woong Na | 6-2,6-3 |
| ITF Turkey F4 | 2018/01/31 09:20 | Dan Dowson v Jung-Woong Na | 6-7,7-5,2-6 |
| ITF Turkey F4 | 2018/01/28 07:30 | Jung-Woong Na v Matej Maruscak | 4-6,7-6,7-6 |
| ITF Japan F6 | 2018/04/14 01:00 | Renta Tokuda v Makoto Ochi | 6-2,6-2 |
| ITF Japan F6 | 2018/04/13 01:30 | Naoki Tajima v Makoto Ochi | 4-6,6-1,0-6 |
| ITF Japan F6 | 2018/04/12 01:00 | Makoto Ochi v Zhe Li | 3-6,6-2,6-3 |
| ITF Japan F6 | 2018/04/11 01:00 | Makoto Ochi v Takuto Niki | 7-5,6-3 |
| ITF Japan F5 | 2018/04/07 01:00 | Makoto Ochi v Zhe Li | 3-6,3-6 |
| ITF Japan F5 | 2018/04/06 01:00 | Ryota Tanuma v Makoto Ochi | 6-2,3-6,6-7 |
| ITF Japan F5 | 2018/04/04 01:00 | Makoto Ochi v Sora Fukuda | 7-6,6-7,6-2 |
| ITF Japan F4 | 2018/03/29 01:00 | Makoto Ochi v Hiroyasu Ehara | 6-4,5-7,4-6 |