Stadium: Court 1 Round: 19 Ground: Hardcourt outdoor
| ITF - M25 Takasaki | 2023/09/17 01:00 | Leo Vithoontien v Ryuhei Azuma | 6-1,6-2 |
| ITF - M15 Nakhon Si Thammarat | 2023/09/06 05:45 | Leo Vithoontien v Pruchya Isarow | 7-6,6-7,0-6 |
| ITF - M15 Nakhon Si Thammarat | 2023/08/31 03:55 | Siddhant Banthia v Leo Vithoontien | 6-4,0-6,6-2 |
| ITF - M15 Nakhon Si Thammarat | 2023/08/29 02:00 | Leo Vithoontien v Jacob Bradshaw | 6-7,6-3,6-1 |
| ITF - M15 Nakhon Si Thammarat | 2023/08/24 05:00 | Leo Vithoontien v Kasidit Samrej | 6-7,2-6 |
| ITF - M15 Nakhon Si Thammarat | 2023/08/23 07:40 | Seon Yong Han v Leo Vithoontien | 7-6,0-6,2-6 |
| ITF - M15 Pittsburgh | 2023/07/26 14:00 | Kyle Seelig v Leo Vithoontien | 6-4,2-6,6-4 |
| ITF - M15 Rochester | 2023/07/18 22:30 | Rafael Tosetto v Leo Vithoontien | 7-6,3-6,6-3 |
| ITF - M25 Takasaki | 2023/09/17 01:00 | Maximus Kawabata v Ryusuke Horiuchi | 1-6,0-6 |
| ITF - M25 Sapporo | 2023/09/11 02:30 | Ryusuke Horiuchi v Yusuke Kusuhara | 3-6,6-3,6-10 |
| ITF - M25 Sapporo | 2023/09/04 03:35 | Ryusuke Horiuchi v Seiya Nakanishi | 6-4,2-6,10-12 |
| ITF - M25 Sapporo | 2023/09/03 03:00 | Ryusuke Horiuchi v Kenta Nakamura | 6-3,6-1 |
| 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 |