Stadium: Centre Court Round: 24 Ground: Hardcourt outdoor
| Challenger Gwangju | 2018/08/17 02:00 | Duckhee Lee v Makoto Ochi | 2-6,1-6 |
| Challenger Busan | 2019/05/06 02:00 | Makoto Ochi v Young Seok Lee | 6-3,6-4 |
| Challenger Nanchang | 2019/04/23 10:00 | Makoto Ochi v Enrique Lopez-Perez | 3-6,0-6 |
| Challenger Nanchang | 2019/04/22 04:55 | Tung-Lin Wu v Makoto Ochi | 3-6,2-6 |
| Challenger Anning | 2019/04/16 03:25 | Makoto Ochi v Jason Kubler | 2-6,1-6 |
| Challenger Anning | 2019/04/15 04:30 | Makoto Ochi v Yuanfeng Li | 6-2,7-6 |
| Challenger Taipei | 2019/04/08 12:00 | Makoto Ochi v Tsung-Hua Yang | 4-6,3-6 |
| ITF M15 Kashiwa | 2019/04/05 01:00 | Shintaro Imai v Makoto Ochi | 2-6,6-7 |
| ITF M15 Kashiwa | 2019/04/04 02:40 | Shinji Hazawa v Makoto Ochi | 2-6,1-6 |
| Challenger Seoul | 2019/04/30 03:35 | Ji Sung Nam v Duckhee Lee | 7-5,6-1 |
| Challenger Nanchang | 2019/04/24 04:15 | Duckhee Lee v Goncalo Oliveira | 3-6,2-6 |
| Challenger Taipei | 2019/04/08 03:20 | Kaichi Uchida v Duckhee Lee | 6-4,6-4 |
| Challenger Shenzhen | 2019/03/15 09:00 | Brayden Schnur v Duckhee Lee | 6-4,4-6,7-5 |
| Challenger Shenzhen | 2019/03/14 10:55 | Zhe Li v Duckhee Lee | 3-6,3-6 |
| Challenger Shenzhen | 2019/03/12 07:20 | Duckhee Lee v Yuichi Sugita | 6-3,6-4 |
| Challenger Shenzhen | 2019/03/11 03:50 | Zihao Xia v Duckhee Lee | 3-6,1-6 |
| Challenger Zhuhai | 2019/03/04 05:25 | Baptiste Crepatte v Duckhee Lee | 6-3,7-6 |