Stadium: Court 11 Round: 54 Ground: Hardcourt outdoor
| 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 |
| Mornington, Singles Qualifying M-ITF-AUS-04A | 2019/03/24 23:00 | van Meter, Joseph W v Ren Nakamura | 3-6,7-5,13-11 |
| Mornington, Singles Qualifying M-ITF-AUS-04A | 2019/03/17 23:00 | Ren Nakamura v Bosnjak, Mislav | 2-6,4-6 |
| ITF - M25 Mildura | 2019/03/06 05:50 | Ren Nakamura v Vuradin, Lucas | 4-6,2-6 |
| Akishima, Singles M-ITF-JPN-08A | 2019/06/11 00:00 | Okagaki, Kosuke v Sam Ryan Ziegann | 6-1,6-0 |
| Guam, Singles M-ITF-GUM-01A | 2019/06/06 00:00 | Moritani, Soichiro v Sam Ryan Ziegann | 6-2,6-2 |
| Guam, Singles M-ITF-GUM-01A | 2019/06/04 00:00 | Sam Ryan Ziegann v Kallioniemi, Marcus | 6-0,6-0 |
| ITF - M15 Karuizawa | 2019/05/28 01:00 | Takeuchi, Kento (1987) v Sam Ryan Ziegann | 6-3,6-3 |
| Nonthaburi, Singles M-ITF-THA-01A | 2019/05/20 04:40 | Jayden Court v Sam Ryan Ziegann | 6-4,7-5 |
| Mornington, Singles Qualifying M-ITF-AUS-04A | 2019/03/24 23:00 | Kazuma Kawachi v Sam Ryan Ziegann | 6-2,6-1 |
| ITF Thailand F9 | 2018/11/10 05:00 | Dubinsky, Vladislav v Sam Ryan Ziegann | 7-6,6-4 |
| ITF Thailand F8 | 2018/11/03 04:30 | Sam Ryan Ziegann v Takuya Kumasaka | 2-6,1-6 |