Ground: Hardcourt outdoor
| 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 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 Noda | 2023/08/23 00:00 | Hiiro Sakamoto v Yuta Tomida | 1-6,7-6,1-6 |
| UTR Pro Miki | 2023/07/02 02:00 | Yuta Tomida v Shunya Maruyama | 6-4,4-6,5-3 |
| UTR Pro Miki | 2023/07/01 02:00 | Ryotaro Taguchi v Yuta Tomida | 1-6,7-5,4-6 |
| UTR Pro Miki | 2023/06/30 03:27 | Yuta Tomida v Yuto Okuchi | 6-3,6-0 |
| UTR Pro Miki | 2023/06/28 03:30 | Yuta Tomida v Yuma Daijima | 7-5,5-1 |
| UTR Pro Miki | 2023/06/27 00:30 | Yuta Tomida v Brody Nejedly | 6-0,6-3 |
| UTR Pro Miki | 2023/06/26 05:00 | Fujii Yuto v Yuta Tomida | 4-6,5-7 |
| ITF M15 Antalya | 2022/05/23 12:30 | Yuta Tomida v Baran Soyler | 2-6,1-6 |