| 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 |
| UTR Pro Tennis Series Miki | 2022/12/07 02:00 | Hiromasa Koyama v Ryohei Takase | 0-0 |
| UTR Pro Osaka | 2023/07/24 05:30 | Shu Matsuoka v Ryoma Matsushita | 3-6,5-7 |
| ITF M15 Monastir | 2023/07/17 07:30 | S Mert Ozdemir v Shu Matsuoka | 1-6,1-6 |
| ITF M15 Monastir | 2023/07/16 15:00 | Shu Matsuoka v Maksim Shin | 3-6,6-1,10-5 |
| ITF M15 Monastir | 2023/07/09 08:30 | Shu Matsuoka v Sanjar Fayziev | 6-3,2-6,5-10 |
| ITF M15 Monastir | 2023/07/03 08:30 | Aleksandr Lobanov v Shu Matsuoka | 6-4,1-6,10-6 |
| ITF M15 Monastir | 2023/06/28 10:00 | Adit Sinha v Shu Matsuoka | 6-3,6-1 |
| ITF M15 Monastir | 2023/06/19 14:00 | Shu Matsuoka v Adit Sinha | 2-6,3-6 |
| ITF M15 Monastir | 2023/06/19 08:30 | Martin Breysach v Shu Matsuoka | 2-6,3-6 |