Stadium: Sub Court B Round: 54 Ground: Hardcourt outdoor
| ITF M25 Bolzano | 2023/07/31 13:00 | Juan Bautista Otegui v Ryusuke Horiuchi | 5-7,6-2,6-0 |
| ITF M15 Perugia | 2023/07/23 09:30 | Ryusuke Horiuchi v Giorgio Ricca | 0-6,4-6 |
| ITF M15 Gubbio | 2023/07/16 10:00 | Ryusuke Horiuchi v Daniel Bagnolini | 0-6,1-6 |
| ITF M25 Padova | 2023/07/09 10:55 | Leonardo Rossi v Ryusuke Horiuchi | 6-2,6-2 |
| ITF M25 Biella | 2023/07/04 16:45 | Joao Eduardo Schiessl v Ryusuke Horiuchi | 6-0,6-3 |
| ITF M25 Biella | 2023/07/03 07:00 | Ryusuke Horiuchi v Gianluca Cadenasso | 5-7,7-6,12-10 |
| ITF M15 Wroclaw | 2023/06/26 09:00 | Alex Bancila v Ryusuke Horiuchi | 6-0,6-2 |
| ITF M25 Mungia | 2023/06/19 09:55 | Ryusuke Horiuchi v Alejandro Garcia | 1-6,2-6 |
| ITF M15 Caloundra | 2023/07/30 00:00 | Timmy Karpinski v Kenta Nakamura | 6-4,6-2 |
| ITF M15 Caloundra | 2023/07/22 23:00 | Anton Shepp v Kenta Nakamura | 6-3,7-5 |
| ITF M25 Anseong | 2023/06/19 06:50 | Young Seok Kim v Kenta Nakamura | 6-0,6-2 |
| ITF M25 Anseong | 2023/06/19 03:25 | Yongjun Shim v Kenta Nakamura | 3-6,2-6 |
| ITF M25 Anseong | 2023/06/18 04:40 | Gwanuk Sim v Kenta Nakamura | 3-6,3-6 |
| ITF M15 Karuizawa | 2023/05/28 01:15 | Kenta Nakamura v Blake Bayldon | 2-6,0-6 |
| ITF M15 Antalya | 2023/05/07 07:00 | Kenta Nakamura v Mateo Del Pino | 5-7,3-6 |
| ITF M15 Antalya | 2023/04/30 07:00 | Tuncay Duran v Kenta Nakamura | 6-0,6-2 |