Stadium: Centre Court Round: 25 Ground: Hardcourt outdoor
| Challenger Busan | 2018/05/14 07:45 | Yusuke Takahashi v Duckhee Lee | 2-6,1-6 |
| ITF Japan F6 | 2016/06/02 02:50 | Duckhee Lee v Yusuke Takahashi | 6-3,6-0 |
| ITF Japan F6 | 2015/06/12 05:30 | Yusuke Takahashi v Duckhee Lee | 2-6,2-6 |
| Challenger Busan | 2018/05/14 07:45 | Yusuke Takahashi v Duckhee Lee | 2-6,1-6 |
| Challenger Gimcheon | 2018/05/09 03:50 | Yusuke Takahashi v Go Soeda | 6-7,2-6 |
| Challenger Gimcheon | 2018/05/07 08:15 | Uisung Park v Yusuke Takahashi | 5-7,2-6 |
| Challenger Seoul | 2018/05/01 05:00 | Kamil Majchrzak v Yusuke Takahashi | 6-2,6-3 |
| Challenger Taipei | 2018/04/11 10:55 | Yusuke Takahashi v Chien Hsun Lo | 3-6,7-6,3-6 |
| Challenger Taipei | 2018/04/10 10:00 | Chun Hsin Tseng v Yusuke Takahashi | 6-7,1-6 |
| ITF Japan F5 | 2018/04/08 03:05 | Zhe Li v Yusuke Takahashi | 6-4,6-7,7-5 |
| ITF Japan F5 | 2018/04/05 02:00 | Shinji Hazawa v Yusuke Takahashi | 5-7,0-6 |
| French Open Qual | 2018/05/25 08:00 | Jaume Munar v Duckhee Lee | 6-7,6-0,7-6 |
| French Open Qual | 2018/05/23 14:40 | Duckhee Lee v Lorenzo Sonego | 6-3,6-4 |
| French Open Qual | 2018/05/21 12:10 | Dennis Novikov v Duckhee Lee | 2-6,2-6 |
| Challenger Busan | 2018/05/17 05:20 | Filip Peliwo v Duckhee Lee | 4-6,6-2,6-4 |
| Challenger Busan | 2018/05/14 07:45 | Yusuke Takahashi v Duckhee Lee | 2-6,1-6 |
| Challenger Gimcheon | 2018/05/08 06:55 | Duckhee Lee v Luke Saville | 7-6,2-6,3-6 |
| Challenger Seoul | 2018/05/01 07:05 | Tatsuma Ito v Duckhee Lee | 6-1,6-3 |
| Challenger Anning | 2018/04/26 04:35 | Mukund Sasikumar v Duckhee Lee | 6-2,7-6 |