Stadium: Court 3 Round: 54 Ground: Hardcourt outdoor
| ITF M15 Anseong | 2019/06/26 04:30 | Kim, Sung Hun v Ren Nakamura | 7-6,1-6,6-0 |
| Gimcheon, Singles M-ITF-KOR-03A | 2019/06/18 01:00 | Ren Nakamura v Park, Minjong | 5-7,6-7 |
| Gimcheon, Singles M-ITF-KOR-03A | 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 | Kikuchi, Gengo v Ren Nakamura | 6-2,6-2 |
| ITF - M15 Karuizawa | 2019/05/29 04:20 | Ren Nakamura v Winter Meagher | 6-3,6-2 |
| ITF M15 Cancun | 2019/05/07 19:45 | Ren Nakamura v Jesse Flores | 2-6,2-6 |
| Matsuyama, Singles M-ITF-JPN-06A | 2019/04/09 01:00 | Sho Shimabukuro v Ren Nakamura | 6-4,6-1 |
| ITF - M15 Kashiwa | 2019/04/01 00:00 | Kaito Uesugi v Ren Nakamura | 6-2,6-2 |
| Taipei, Singles M-ITF-TPE-01A | 2019/07/15 04:30 | Tsai, Mu Fu v Seita Watanabe | 0-6,0-6 |
| Gimcheon, Singles M-ITF-KOR-03A | 2019/06/18 03:20 | Seita Watanabe v Im, Seong Taek | 3-6,7-6,12-14 |
| Gimcheon, Singles M-ITF-KOR-03A | 2019/06/12 03:20 | Oh, Seong-Gook v Seita Watanabe | 6-7,6-2,6-3 |
| Gimcheon, Singles M-ITF-KOR-03A | 2019/06/11 02:50 | Seita Watanabe v Lim, Hyung-Chan | 6-4,6-0 |
| Gimcheon, Singles M-ITF-KOR-03A | 2019/06/10 02:00 | Seita Watanabe v Han, Jin Sung | 6-1,6-2 |
| ITF - M15 Daegu | 2019/06/06 02:00 | Na, Jung-Woong v Seita Watanabe | 6-3,6-2 |
| ITF - M15 Daegu | 2019/06/05 03:55 | Seita Watanabe v Issei Okamura | 6-4,7-6 |
| ITF - M15 Daegu | 2019/06/04 02:20 | Seita Watanabe v Shin, Seung-Hun | 6-0,6-1 |