Stadium: Court F Round: 24 Ground: Hardcourt indoor
| Challenger Yokkaichi | 2019/08/06 03:15 | Ren Nakamura v Lucas Catarina | 1-6,2-6 |
| ITF M25 Taipei | 2019/07/23 03:50 | Ren Nakamura v Sam Taylor | 4-6,7-5,6-10 |
| ITF M25 Taipei | 2019/07/22 02:00 | Ren Nakamura v Harry Thursfield | 6-2,6-2 |
| ITF M25 Taipei | 2019/07/16 03:50 | Ren Nakamura v Seita Watanabe | 6-4,4-6,5-10 |
| ITF M15 Anseong | 2019/06/26 04:30 | Sung Hun Kim v Ren Nakamura | 7-6,1-6,6-0 |
| ITF M15 Gimcheon | 2019/06/18 01:00 | Ren Nakamura v Minjong Park | 5-7,6-7 |
| ITF M15 Gimcheon | 2019/06/17 01:00 | Ren Nakamura v Sam Ryan Ziegann | 2-6,6-2,10-7 |
| ITF M15 Karuizawa | 2019/05/30 06:15 | Gengo Kikuchi v Ren Nakamura | 6-2,6-2 |
| Challenger Yokkaichi | 2019/08/08 08:10 | Shinji Hazawa v Tatsuma Ito | 0-6,3-6 |
| Challenger Yokkaichi | 2019/08/07 05:15 | Renta Tokuda v Shinji Hazawa | 6-4,6-7,0-6 |
| Challenger Yokkaichi | 2019/08/05 03:40 | Shinji Hazawa v Thomas Fancutt | 6-4,6-1 |
| ITF M25 Kunshan | 2019/07/05 01:30 | Jonathan Mridha v Shinji Hazawa | 4-6,6-1,6-4 |
| ITF M25 Kunshan | 2019/07/04 03:50 | Bingyu Yu v Shinji Hazawa | 1-6,1-6 |
| ITF M25 Kunshan | 2019/07/02 09:35 | Garrett Johns v Shinji Hazawa | 6-7,1-6 |
| ITF M25 Yinchuan | 2019/06/28 07:00 | Xin Gao v Shinji Hazawa | 6-2,6-4 |
| ITF M25 Yinchuan | 2019/06/28 03:35 | Zhou Mingzhou v Shinji Hazawa | 4-6,2-6 |