Stadium: Sub-Court B Round: 54 Ground: Hardcourt outdoor
| ITF M25 Canberra | 2023/03/14 23:00 | Ko Suzuki v Naoki Tajima | 2-6,5-7 |
| ITF M25 Sapporo | 2023/09/03 01:00 | Naoki Tajima v Hiroki Sakagawa | 2-6,3-6 |
| 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 Sapporo | 2023/09/10 01:00 | Mao Takada v Ko Suzuki | 1-6,3-6 |
| ITF M25 Sapporo | 2023/09/08 04:45 | Daisuke Sumizawa v Ko Suzuki | 7-5,6-2 |
| ITF M25 Sapporo | 2023/09/07 02:50 | Ko Suzuki v Ryotaro Taguchi | 6-4,6-3 |
| ITF M25 Sapporo | 2023/09/06 03:05 | Ko Suzuki v Woobin Shin | 6-1,6-4 |
| ITF M25 Sapporo | 2023/09/04 01:00 | Koki Matsuda v Ko Suzuki | 6-1,4-6,7-10 |
| ITF M25 Tainan | 2023/08/20 02:00 | Ko Suzuki v Kai-I Wang | 1-6,6-0,4-10 |
| ITF M25 Tainan | 2023/08/15 03:55 | Lucio Carnevalle v Ko Suzuki | 3-6,6-2,6-2 |
| ITF M25 Tainan | 2023/08/14 02:00 | Ko Suzuki v Tzu Li Chang | 6-2,6-3 |