Estadio: Court 11 Round: 54 Ground: Hardcourt outdoor
| ITF M15 Karuizawa | 2019/05/30 06:15 | Gengo Kikuchi 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 |
| ITF M25 Matsuyama | 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 |
| ITF M15 Mornington | 2019/03/24 23:00 | Joseph W. Van Meter v Ren Nakamura | 3-6,7-5,13-11 |
| ITF M15 Mornington | 2019/03/17 23:00 | Ren Nakamura v Mislav Bosnjak | 2-6,4-6 |
| ITF M25 Mildura | 2019/03/06 05:50 | Ren Nakamura v Lucas Vuradin | 4-6,2-6 |
| ITF M15 Akishima | 2019/06/11 00:00 | Kosuke Okagaki v Sam Ryan Ziegann | 6-1,6-0 |
| ITF M15 Guam | 2019/06/06 00:00 | Soichiro Moritani v Sam Ryan Ziegann | 6-2,6-2 |
| ITF M15 Guam | 2019/06/04 00:00 | Sam Ryan Ziegann v Marcus Kallioniemi | 6-0,6-0 |
| ITF M15 Karuizawa | 2019/05/28 01:00 | Kento Takeuchi v Sam Ryan Ziegann | 6-3,6-3 |
| ITF M25 Nonthaburi | 2019/05/20 04:40 | Jayden Court v Sam Ryan Ziegann | 6-4,7-5 |
| ITF M15 Mornington | 2019/03/24 23:00 | Kazuma Kawachi v Sam Ryan Ziegann | 6-2,6-1 |
| ITF Tailandia F9 | 2018/11/10 05:00 | Vladislav Dubinsky v Sam Ryan Ziegann | 7-6,6-4 |
| ITF Tailandia F8 | 2018/11/03 04:30 | Sam Ryan Ziegann v Takuya Kumasaka | 2-6,1-6 |