Stadium: Court 5 Round: 25 Ground: Hardcourt indoor
| ITF M15 Hinode | 2024/03/11 01:00 | Hiromasa Koyama v Hong Kit Wong | 7-6,3-6,4-10 |
| UTR Pro Noda | 2023/08/26 00:00 | Hiromasa Koyama v Paul Howe | 6-7,6-7 |
| 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 |
| ITF M15 Tokyo | 2024/07/02 01:00 | Ryotaro Matsumura v Ren Nakamura | 7-5,6-1 |
| ITF M15 Tokyo | 2024/07/01 01:00 | Ryotaro Matsumura v Toki Adachi | 6-2,6-1 |
| UTR Pro Kawaguchi | 2024/06/30 01:00 | Corey Craig v Ryotaro Matsumura | 3-6,6-4,6-4 |
| UTR Pro Kawaguchi | 2024/06/29 07:30 | Ryotaro Matsumura v Sam Ryan Ziegann | 7-6,6-1 |
| UTR Pro Kawaguchi | 2024/06/27 04:20 | Ryotaro Matsumura v Haruki Katsushima | 6-1,5-1 |
| UTR Pro Kawaguchi | 2024/06/26 03:30 | Ryotaro Matsumura v Tomislav E Papac | 6-0,6-2 |
| UTR Pro Kawaguchi | 2024/06/25 01:30 | Ryotaro Matsumura v Seiya Nakanishi | 6-1,6-0 |
| UTR Pro Kawaguchi | 2024/06/24 06:30 | Ryotaro Matsumura v Kosuke Nakanishi | 6-4,6-2 |