Stadium: Court 4 Round: 25 Ground: Hardcourt outdoor
| ITF M25 Takasaki | 2023/09/18 00:55 | Leo Vithoontien v Ryusuke Horiuchi | 6-2,7-6 |
| 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 M25 Sapporo | 2023/09/12 03:45 | Keisuke Saitoh v Tomohiro Masabayashi | 5-7,3-6 |
| ITF M25 Sapporo | 2023/09/06 01:00 | Keisuke Saitoh v Tomohiro Masabayashi | 4-6,6-3,1-6 |
| ITF M25 Hong Kong | 2023/08/31 02:00 | Naoki Nakagawa v Keisuke Saitoh | 6-4,6-7,6-1 |
| ITF M25 Hong Kong | 2023/08/30 02:00 | Keisuke Saitoh v Ji Hoon Son | 6-3,7-6 |
| ITF M15 Caloundra | 2023/08/04 00:55 | Isaac Becroft v Keisuke Saitoh | 6-3,6-4 |
| ITF M15 Caloundra | 2023/08/03 00:50 | Tai Leonard Sach v Keisuke Saitoh | 2-6,1-6 |
| ITF M15 Caloundra | 2023/08/01 04:50 | Keisuke Saitoh v Edward Winter | 7-6,6-2 |
| ITF M15 Caloundra | 2023/07/27 00:00 | Isaac Becroft v Keisuke Saitoh | 5-7,6-2,6-1 |