Stadium: Court 9 Round: 26 Ground: Clay
| ITF - M15 Karuizawa | 2019/05/29 02:30 | Gengo Kikuchi v Taketo Takamisawa | 6-0,6-1 |
| ITF M25 Matsuyama | 2019/04/09 05:05 | Masamichi Imamura v Gengo Kikuchi | 7-6,6-1 |
| ITF M15 - Kashiwa | 2019/04/03 02:20 | Gengo Kikuchi v Shintaro Imai | 3-6,1-6 |
| ITF M15 - Kashiwa | 2019/04/01 03:00 | Kaito Uesugi v Gengo Kikuchi | 2-6,3-6 |
| ITF M15 - Kashiwa | 2019/04/01 00:00 | Yuichiro Inui v Gengo Kikuchi | 4-6,2-6 |
| ITF M15 Kofu | 2019/03/21 06:55 | Mick Veldheer v Gengo Kikuchi | 7-6,6-3 |
| ITF M15 Kofu | 2019/03/19 01:00 | Gengo Kikuchi v Blake Ellis | 7-5,6-1 |
| ITF M15 - Nishi-Tokyo | 2019/03/13 02:20 | Seong Chan Hong v Gengo Kikuchi | 4-6,6-3,7-6 |
| 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 M25 Mildura | 2019/03/04 23:00 | William Ma v Ren Nakamura | 4-6,2-6 |