| UTR Pro Osaka | 2023/07/29 00:30 | Ryota Kaneda v Koki Ohnuma | 0-0 |
| 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 Miki | 2023/02/09 00:30 | Yuichiro Inui v Hiromasa Koyama | 7-5,6-1 |
| UTR Pro Miki | 2023/02/07 00:30 | Kento Tagashira v Hiromasa Koyama | 6-3,7-5 |
| UTR Pro Miki | 2023/02/06 03:30 | Hiromasa Koyama v Yuta Kawahashi | 0-6,0-6 |