Stadium: Court 4 Round: 45 Ground: Hardcourt outdoor
| ITF - M15 Kashiwa | 2019/04/01 00:00 | Kuan-Yi Lee v Brymer, Gage | 6-7,7-5,10-5 |
| ITF - M15 Tsukuba | 2019/03/28 01:00 | Kuan-Yi Lee v Yuki Mochizuki | 2-6,6-1,5-7 |
| ITF - M15 Tsukuba | 2019/03/26 02:15 | Shinji Hazawa v Kuan-Yi Lee | 3-6,4-6 |
| ITF - M15 Sharm El Sheikh | 2019/03/07 08:00 | Manafov, Vladyslav v Kuan-Yi Lee | 6-1,7-6 |
| ITF - M15 Sharm El Sheikh | 2019/03/05 08:00 | Kuan-Yi Lee v Daniel Michalski | 6-0,6-0 |
| ITF - M15 Sharm El Sheikh | 2019/02/27 09:40 | Kuan-Yi Lee v Hossam, Youssef | 6-7,4-6 |
| ITF M15 Anning | 2019/01/17 03:00 | Bessire, Andrea v Kuan-Yi Lee | 1-6,3-6 |
| ITF M15 Anning | 2019/01/15 03:45 | Prashanth, N. Vijay Sundar v Kuan-Yi Lee | 7-5,5-7,6-7 |
| ITF - M15 Kashiwa | 2019/04/01 00:00 | Daisuke Sumizawa v Kazuki Nishiwaki | 6-2,2-6,8-10 |
| ITF - M15 Tsukuba | 2019/03/27 01:00 | Makoto Ochi v Kazuki Nishiwaki | 6-3,6-1 |
| Kofu, Qualifications Simples M-ITF-JPN-03A | 2019/03/20 05:10 | Veldheer, Mick v Kazuki Nishiwaki | 4-6,6-1,6-4 |
| ITF - M15 Sharm El Sheikh | 2019/02/18 12:15 | Kazuki Nishiwaki v Giorgio Ricca | 7-5,6-7,6-10 |
| ITF - M15 Sharm El Sheikh | 2019/02/18 07:30 | Kazuki Nishiwaki v Mathys Erhard | 6-0,6-1 |
| ITF M15 Anning | 2019/01/12 05:05 | Kazuki Nishiwaki v Velotti, Agustin | 6-7,2-6 |
| ITF M15 Anning | 2019/01/11 04:40 | Kazuki Nishiwaki v Nitin Kumar Sinha | 6-7,6-2,6-4 |
| ITF M15 Anning | 2019/01/10 03:00 | Taisei Ichikawa v Kazuki Nishiwaki | 5-7,3-6 |