Stadium: Sub Court B Round: 27 Ground: Hardcourt outdoor
| ITF M25 Anseong | 2023/06/21 04:10 | Daisuke Sumizawa v Ko Suzuki | 7-5,6-3 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/07 01:00 | Tomohiro Masabayashi v Daisuke Sumizawa | 3-6,3-6 |
| Hong Kong, Simples M-ITF-HKG-04A | 2023/08/30 04:10 | Egor Gerasimov v Daisuke Sumizawa | 4-6,6-3,7-5 |
| Hong Kong, Simples M-ITF-HKG-04A | 2023/08/28 02:00 | Daisuke Sumizawa v Susanto, David Agung | 6-2,6-2 |
| Hong Kong, Simples M-ITF-HKG-04A | 2023/08/27 02:30 | Daisuke Sumizawa v Pengyu Lu | 3-6,6-1,10-5 |
| ITF M15 Caloundra | 2023/08/04 04:20 | Daisuke Sumizawa v Luke Saville | 4-6,4-6 |
| ITF M15 Caloundra | 2023/08/03 00:00 | Daisuke Sumizawa v Jeremy Zhang | 6-2,6-1 |
| ITF M15 Caloundra | 2023/08/01 04:45 | Daisuke Sumizawa v Taiyo Yamanaka | 4-6,6-3,7-6 |
| ITF M15 Caloundra | 2023/07/28 01:00 | Daisuke Sumizawa v Thomas Fancutt | 6-3,6-7,3-6 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/07 02:50 | Ko Suzuki v Ryotaro Taguchi | 6-4,6-3 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 2023/09/06 03:05 | Ko Suzuki v Woobin Shin | 6-1,6-4 |
| Sapporo, Singles Main, M-ITF-JPN-02A | 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 |
| ITF M25 Tainan | 2023/08/13 02:00 | Ko Suzuki v Jeffrey Hsu | 6-3,6-2 |
| ITF M25 Anseong | 2023/06/21 04:10 | Daisuke Sumizawa v Ko Suzuki | 7-5,6-3 |