Stadium: Court C1 Round: 54 Ground: Hardcourt outdoor
| ITF M25 Tsukuba | 2023/03/27 00:30 | Yuttana Charoenphon v Ko Suzuki | 2-6,2-6 |
| ITF M25 Canberra | 2023/03/20 22:50 | Ko Suzuki v Seon Yong Han | 6-3,2-6,6-10 |
| ITF M25 Canberra | 2023/03/19 23:00 | Ko Suzuki v Luke Sorensen | 6-1,6-2 |
| ITF M25 Canberra | 2023/03/14 23:00 | Ko Suzuki v Naoki Tajima | 2-6,5-7 |
| ITF M25 Canberra | 2023/03/13 23:00 | Ko Suzuki v Matthew Woerndle | 6-0,6-2 |
| ITF M25 Canberra | 2023/03/12 23:00 | Ko Suzuki v Luke Sorensen | 6-1,6-4 |
| ITF M25 Sapporo | 2022/09/08 01:00 | Ko Suzuki v Ryusuke Horiuchi | 2-6,6-3,3-6 |
| ITF M25 Sapporo | 2022/09/01 02:40 | Ko Suzuki v Tatsuma Ito | 3-6,2-6 |
| ITF M25 Tsukuba | 2023/03/27 00:30 | Shunsuke Nakagawa v Tomohiro Masabayashi | 5-7,6-3,10-7 |
| Challenger Matsuyama | 2022/11/06 03:45 | Jason Jung v Shunsuke Nakagawa | 6-1,6-1 |
| ITF M25 Sapporo | 2022/09/08 03:20 | Keisuke Saitoh v Shunsuke Nakagawa | 6-1,6-2 |
| ITF M25 Sapporo | 2022/09/07 02:20 | Shunsuke Nakagawa v Geni Inoue | 7-6,6-0 |
| ITF M25 Sapporo | 2022/09/05 03:50 | Geni Inoue v Shunsuke Nakagawa | 6-2,0-6,6-10 |
| ITF M25 Sapporo | 2022/09/04 02:50 | Shunsuke Nakagawa v Nishith Naveen | 6-0,6-0 |