Stadion: Center Court A Round: 54 Ground: Hardcourt outdoor
| ITF - M25 - Tainan | 2023/08/22 02:00 | Naoki Tajima v Leonid Sheyngezikht | 3-6,5-7 |
| ITF - M25 - Tainan | 2023/08/17 02:00 | Ergi Kirkin v Naoki Tajima | 6-3,6-4 |
| ITF - M25 - Tainan | 2023/08/15 01:55 | Yu Hsiang Su v Naoki Tajima | 3-6,1-6 |
| ITF - M15 - Caloundra | 2023/07/31 23:50 | Naoki Tajima v Anton Shepp | 6-1,4-6,7-10 |
| ITF - M15 - Caloundra | 2023/07/25 23:50 | Naoki Tajima v Brandon Walkin | 6-7,6-3,4-6 |
| ITF - M15 - Caloundra | 2023/07/25 00:00 | Naoki Tajima v Jesse Delaney | 6-2,6-2 |
| ITF - M15 - Caloundra | 2023/07/24 04:00 | Naoki Tajima v Thomas Nicholas Gadecki | 6-2,6-2 |
| ITF - M25 - Anseong | 2023/06/21 05:15 | Naoki Tajima v Yuki Mochizuki | 0-6,1-6 |
| ITF - M25 - Anseong | 2023/06/21 03:40 | Hiroki Sakagawa v Duckhee Lee | 1-6,2-6 |
| ITF - M25 - Anseong | 2023/06/19 05:25 | Seung Woo Cho v Hiroki Sakagawa | 6-1,1-6,6-10 |
| ITF - M25 - Anseong | 2023/06/19 01:00 | Hyun Woo Cho v Hiroki Sakagawa | 6-4,2-6,4-10 |
| ITF - M25 - Anseong | 2023/06/18 01:00 | Hiroki Sakagawa v Jungmin Hwang | 6-0,6-2 |
| UTR Pro Tennis Series - Texas | 2022/08/20 18:00 | Franco Ribero v Hiroki Sakagawa | 7-6,5-0 |
| UTR Pro Tennis Series - Texas | 2022/08/18 19:30 | Hiroki Sakagawa v Alex Koong | 6-2,5-2 |
| UTR Pro Tennis Series - Texas | 2022/08/17 18:00 | Callaway Clark v Hiroki Sakagawa | 0-6,6-4,7-6 |
| UTR Pro Tennis Series - Texas | 2022/08/16 22:53 | Hiroki Sakagawa v Vishwa Aduru | 6-0,6-3 |