| UTR Pro Noda | 2023/08/25 00:00 | Hiromasa Koyama v Hiiro Sakamoto | 1-6,1-6 |
| UTR Pro Noda | 2023/08/23 06:30 | Hiromasa Koyama v Yuta Tomida | 1-6,3-6 |
| UTR Pro Osaka | 2023/07/30 04:30 | Koki Ohnuma v Hiromasa Koyama | 6-3,5-2 |
| UTR Pro Osaka | 2023/07/28 06:54 | Hiromasa Koyama v Ryoma Matsushita | 1-6,2-6 |
| UTR Pro Osaka | 2023/07/27 06:00 | Hiromasa Koyama v Shu Matsuoka | 1-6,4-6 |
| UTR Pro Osaka | 2023/07/25 00:30 | Brody Nejedly-Krall v Hiromasa Koyama | 6-2,6-3 |
| UTR Pro Miki | 2023/02/12 00:30 | Hiromasa Koyama v Shion Itsusaki | 4-6,6-4,5-7 |
| UTR Pro Miki | 2023/02/10 03:30 | Yuji Arimura v Hiromasa Koyama | 3-6,3-6 |
| UTR Pro Noda | 2023/08/25 05:20 | Ryotaro Matsumura v Paul Howe | 6-2,6-0 |
| UTR Pro Noda | 2023/08/24 02:34 | Brody Nejedly-Krall v Paul Howe | 2-6,6-7 |
| UTR Pro Noda | 2023/08/22 05:32 | Marsel Znuderl v Paul Howe | 6-4,3-6,2-6 |
| UTR Pro Noda | 2023/08/21 00:30 | Paul Howe v Tomonobu Inagi | 3-6,5-7 |