Stadium: Indoor C4 Round: 46
| Challenger Seoul | 2018/05/01 06:30 | Renta Tokuda v Yang, Tsung-Hua | 1-6,2-6 |
| Challenger Seoul Qual | 2018/04/30 05:00 | Renta Tokuda v Grills, Jacob | 6-3,6-2 |
| Challenger Seoul Qual | 2018/04/29 04:55 | Renta Tokuda v Lim, Yong-Kyu | 6-4,6-4 |
| ITF Japan F6 | 2018/04/15 04:00 | Ehara, Hiroyasu v Renta Tokuda | 0-6,6-7 |
| ITF Japan F6 | 2018/04/14 01:00 | Renta Tokuda v Makoto Ochi | 6-2,6-2 |
| ITF Japan F6 | 2018/04/13 03:15 | Renta Tokuda v Jumpei Yamasaki | 4-6,6-2,6-4 |
| ITF Japan F6 | 2018/04/10 02:45 | Renta Tokuda v Sho Shimabukuro | 6-4,4-6,6-2 |
| ITF Japan F5 | 2018/04/04 01:00 | Taisei Ichikawa v Renta Tokuda | 6-3,6-3 |
| Challenger Gimcheon Qual | 2018/05/05 06:00 | Kim, Young Seok v Dong Ju Kim | 6-1,6-3 |
| Challenger Seoul | 2018/05/01 04:35 | Jordan Thompson v Kim, Young Seok | 6-1,6-2 |
| ITF Thailand F12 Qual | 2017/12/10 03:00 | Kim, Young Seok v Jeong, Young-Hoon | 4-6,3-6 |
| ITF Thailand F11 | 2017/12/05 05:05 | Alexey Vatutin v Kim, Young Seok | 6-1,3-6,7-6 |
| ITF Thailand F11 Qual | 2017/12/04 03:00 | Kim, Young Seok v Boyer, Dusty H | 6-3,6-4 |
| ITF Thailand F11 Qual | 2017/12/03 03:00 | Kim, Young Seok v Congsup Congcar | 3-6,6-1,6-3 |
| ITF Thailand F10 | 2017/11/28 04:30 | Kim, Young Seok v Yan Bai | 3-6,7-6,3-6 |
| Challenger Gwangju Qual | 2017/09/16 03:20 | Kim, Young Seok v Matosevic, Marinko | 5-7,1-6 |