Stadium: Centre Court Round: 27 Ground: Hardcourt indoor
| Challenger Kobe | 2018/11/16 04:50 | Yoshihito Nishioka v Soonwoo Kwon | 6-1,3-6,6-4 |
| Challenger Kobe | 2018/11/15 02:00 | Akira Santillan v Soonwoo Kwon | 2-6,7-5,6-7 |
| Challenger Kobe | 2018/11/14 03:20 | Renta Tokuda v Soonwoo Kwon | 3-6,6-1,1-6 |
| Challenger Shenzhen 2 | 2018/10/30 05:10 | Soonwoo Kwon v Tsung-Hua Yang | 5-7,3-6 |
| Challenger Kaohsiung | 2018/09/23 07:55 | Gael Monfils v Soonwoo Kwon | 6-4,2-6,6-1 |
| Challenger Kaohsiung | 2018/09/22 06:30 | Soonwoo Kwon v Malek Jaziri | 6-3,6-4 |
| Challenger Kaohsiung | 2018/09/21 06:00 | Soonwoo Kwon v Brayden Schnur | 6-3,6-4 |
| Challenger Kaohsiung | 2018/09/19 09:30 | Lloyd Harris v Soonwoo Kwon | 3-6,5-7 |
| Challenger Pune | 2018/11/20 10:50 | Arjun Kadhe v Ramkumar Ramanathan | 6-3,6-2 |
| Challenger Bratislava | 2018/11/08 11:35 | Ramkumar Ramanathan v Matthias Bachinger | 3-6,6-3,2-6 |
| Challenger Bratislava | 2018/11/06 12:15 | Ramkumar Ramanathan v Sergio Gutierrez-Ferrol | 6-3,7-5 |
| Challenger Shenzhen 2 | 2018/10/31 02:30 | Ramkumar Ramanathan v Mohamed Safwat | 6-7,4-6 |
| Challenger Shenzhen 2 | 2018/10/30 03:30 | Ramkumar Ramanathan v Sumit Nagal | 3-6,6-4,7-6 |
| Challenger Liuzhou | 2018/10/23 09:05 | Alejandro Davidovich Fokina v Ramkumar Ramanathan | 7-6,6-3 |
| Challenger Ningbo | 2018/10/15 04:05 | Ramkumar Ramanathan v Yunseong Chung | 6-1,6-7,6-7 |
| ATP Shanghai | 2018/10/07 08:15 | Hubert Hurkacz v Ramkumar Ramanathan | 6-7,6-4,7-5 |