Stadium: Center Court Round: 26 Ground: Hardcourt outdoor
| Challenger Yokohama | 2017/03/05 03:00 | Yuichi Sugita v Soonwoo Kwon | 6-4,2-6,7-6 |
| Challenger Bangkok | 2019/02/15 04:00 | Soonwoo Kwon v Tatsuma Ito | 3-6,6-4,1-6 |
| Challenger Bangkok | 2019/02/14 05:20 | Soonwoo Kwon v Oriol Roca Batalla | 6-1,6-1 |
| Challenger Bangkok | 2019/02/13 03:00 | Hiroki Moriya v Soonwoo Kwon | 1-6,5-7 |
| Challenger Bangkok | 2019/02/12 03:00 | Soonwoo Kwon v Mukund Sasikumar | 6-1,6-1 |
| Challenger Chennai | 2019/02/07 06:30 | Soonwoo Kwon v Brydan Klein | 4-6,6-4,3-6 |
| Challenger Chennai | 2019/02/06 05:40 | Soonwoo Kwon v Alexander Zhurbin | 6-1,6-2 |
| Australian Open | 2019/01/09 00:30 | Yosuke Watanuki v Soonwoo Kwon | 7-5,6-4 |
| Challenger Kobe | 2018/11/16 04:50 | Yoshihito Nishioka v Soonwoo Kwon | 6-1,3-6,6-4 |
| Challenger Bangkok | 2019/02/14 04:30 | Yuichi Sugita v Tobias Kamke | 6-3,0-6,4-6 |
| Challenger Bangkok | 2019/02/13 03:00 | Yuichi Sugita v Dimitar Kuzmanov | 6-4,6-4 |
| Australian Open | 2019/01/10 04:10 | Lorenzo Sonego v Yuichi Sugita | 6-1,6-2 |
| Australian Open | 2019/01/09 00:35 | Lorenzo Giustino v Yuichi Sugita | 6-7,6-2,4-6 |
| Challenger Noumea | 2019/01/03 08:30 | Yuichi Sugita v Jurij Rodionov | 1-6,6-7 |
| Challenger Noumea | 2019/01/01 02:45 | Yuichi Sugita v Daniel Masur | 6-4,1-6,6-2 |
| Challenger Shenzhen 2 | 2018/11/01 02:30 | Aleksandr Nedovyesov v Yuichi Sugita | 7-6,6-4 |
| Challenger Shenzhen 2 | 2018/10/30 04:30 | Brayden Schnur v Yuichi Sugita | 3-6,2-6 |