Stadium: Centre Court Round: 25 Ground: Hardcourt outdoor
| Challenger Kobe | 2017/11/07 04:25 | Duckhee Lee v Tatsuma Ito | 2-6,1-6 |
| Challenger Gimcheon | 2017/05/02 05:55 | Tatsuma Ito v Duckhee Lee | 6-4,3-6,4-6 |
| Challenger Shenzhen | 2017/03/14 06:00 | Duckhee Lee v Tatsuma Ito | 6-1,5-7,6-4 |
| Challenger Kaohsiung | 2015/09/21 07:40 | Tatsuma Ito v Duckhee Lee | 4-6,7-6,6-3 |
| Challenger Kyoto | 2018/02/21 08:10 | Blake Ellis v Tatsuma Ito | 4-6,6-3,6-4 |
| Challenger Kyoto | 2018/02/19 07:10 | Yuta Shimizu v Tatsuma Ito | 2-6,3-6 |
| Challenger Dallas | 2018/01/29 18:45 | Mackenzie McDonald v Tatsuma Ito | 7-5,6-3 |
| Australian Open Qual | 2018/01/10 08:50 | Tatsuma Ito v Casper Ruud | 6-4,1-6,4-6 |
| Challenger Bangkok | 2018/01/01 08:00 | Tatsuma Ito v Blaz Rola | 6-7,6-7 |
| Challenger Hua Hin | 2017/11/25 09:35 | Tatsuma Ito v John Millman | 6-7,2-6 |
| Challenger Hua Hin | 2017/11/24 09:20 | Soonwoo Kwon v Tatsuma Ito | 6-1,4-6,4-6 |
| Challenger Hua Hin | 2017/11/23 06:55 | Maverick Banes v Tatsuma Ito | 1-6,6-7 |
| Challenger Chennai | 2018/02/16 05:30 | Duckhee Lee v Yuki Bhambri | 5-7,2-6 |
| Challenger Chennai | 2018/02/15 05:30 | Antoine Escoffier v Duckhee Lee | 2-6,6-3,3-6 |
| Challenger Chennai | 2018/02/14 04:30 | Abhinav Sanjeev Shanmugam v Duckhee Lee | 2-6,4-6 |
| Challenger Chennai | 2018/02/12 07:00 | N. Vijay Sundar Prashanth v Duckhee Lee | 3-6,4-6 |
| ITF China F3 | 2018/01/23 05:45 | Duckhee Lee v Huixin Wang | 1-6,3-6 |
| Australian Open Qual | 2018/01/14 00:45 | Ruben Bemelmans v Duckhee Lee | 6-4,6-4 |
| Australian Open Qual | 2018/01/13 01:30 | Duckhee Lee v Frank Dancevic | 4-6,7-6,6-3 |
| Australian Open Qual | 2018/01/10 06:40 | Ze Zhang v Duckhee Lee | 3-6,6-3,3-6 |