Stadium: Court 2 Round: 28 Ground: Hardcourt outdoor
| Challenger Zhuhai | 2018/03/06 06:55 | Tatsuma Ito v Stefano Napolitano | 3-6,3-6 |
| Challenger Yokohama | 2018/03/04 02:30 | Yasutaka Uchiyama v Tatsuma Ito | 2-6,6-3,6-4 |
| Challenger Yokohama | 2018/03/02 02:00 | Tatsuma Ito v Hiroki Moriya | 6-3,6-3 |
| Challenger Yokohama | 2018/02/28 03:55 | Tatsuma Ito v Jason Kubler | 3-6,6-3,7-6 |
| Challenger Yokohama | 2018/02/26 04:30 | Tatsuma Ito v Kaito Uesugi | 6-2,6-3 |
| 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 |
| ITF Japan F2 | 2018/03/12 02:30 | Seong Chan Hong v Shuichi Sekiguchi | 6-4,1-6,7-6 |
| Davis Cup | 2018/02/02 07:40 | Aqeel Khan v Seong Chan Hong | 4-6,7-5,7-5 |
| Challenger Gwangju | 2017/09/19 06:35 | Seong Chan Hong v Luke Saville | 6-2,4-6,6-7 |
| ITF Korea F5 | 2017/06/30 02:00 | Seong Chan Hong v Young Seok Kim | 6-7,4-6 |
| ITF Korea F5 | 2017/06/29 01:30 | Seong Chan Hong v Jung-Woong Na | 6-4,2-6,7-6 |
| ITF Korea F5 | 2017/06/28 01:00 | Seong Chan Hong v Dong-Hak Sin | 7-5,6-3 |
| ITF Korea F5 | 2017/06/27 01:30 | Seong Chan Hong v Seong Jae Han | 6-1,6-3 |
| ITF Korea F5 | 2017/06/26 01:30 | Seong Chan Hong v Seoung Hun Lee | 6-3,6-0 |