Stadium: Court 4 Round: 24 Ground: Hardcourt outdoor
| Challenger Yokohama | 2019/02/25 02:40 | Yunseong Chung v Yang, Tsung-Hua | 4-6,3-6 |
| Bangkok II, Thailand | 2019/02/19 03:00 | Gianluca Mager v Yunseong Chung | 6-4,6-4 |
| Bangkok II, Thailand | 2019/02/18 05:20 | Yunseong Chung v Pedro Cachin | 6-2,6-1 |
| Challenger Launceston | 2019/01/30 02:40 | Yunseong Chung v Lorenzo Giustino | 3-6,7-6,3-6 |
| Challenger Launceston | 2019/01/28 05:55 | Yunseong Chung v Rubin Statham | 6-4,6-3 |
| Challenger - Burnie | 2019/01/21 23:00 | Yunseong Chung v Lorenzo Giustino | 2-6,3-6 |
| Challenger - Burnie | 2019/01/21 00:30 | Samper-Montana, Jordi v Yunseong Chung | 5-7,1-6 |
| Challenger Canberra | 2019/01/07 00:40 | Yunseong Chung v Klein, Brydan | 6-7,7-6,0-6 |
| Challenger Zhuhai | 2019/03/04 02:00 | Heliovaara, Harri v Xia, Haitong | 6-1,6-4 |
| Challenger Champaign | 2018/11/13 16:00 | Heliovaara, Harri v Torpegaard, Mikael | 3-6,7-5,6-4 |
| Challenger Charlottesville | 2018/10/27 14:00 | Marcos Giron v Heliovaara, Harri | 3-6,6-1,6-1 |
| Challenger Stockton | 2018/10/01 17:00 | Heliovaara, Harri v Sarkissian, Alexander | 6-4,4-6,4-6 |
| Challenger Stockton | 2018/09/30 19:35 | Heliovaara, Harri v Verbeek, Sem | 6-1,6-4 |
| Challenger Stockton | 2018/09/29 20:30 | Heliovaara, Harri v Roelofse, Ruan | 7-6,6-1 |
| Challenger Tiburon | 2018/09/22 21:55 | Renzo Olivo v Heliovaara, Harri | 6-2,3-6,7-6 |
| Coupe Davis | 2018/09/15 09:40 | Mohamed Safwat v Heliovaara, Harri | 6-2,6-4 |