Estadio: Court 3 Round: 25 Ground: Clay
| Challenger de Meerbusch | 2023/08/10 13:05 | Ergi Kirkin v Camilo Ugo Carabelli | 1-6,4-6 |
| Challenger de Meerbusch | 2023/08/09 09:55 | Ergi Kirkin v Rudolf Molleker | 6-4,7-6 |
| Challenger de Meerbusch | 2023/08/07 15:00 | Ergi Kirkin v John Sperle | 7-6,6-3 |
| Challenger de Meerbusch | 2023/08/06 15:40 | Ergi Kirkin v Marcelo Zormann | 6-3,6-1 |
| Challenger de Zug | 2023/07/25 12:05 | Ergi Kirkin v Otto Virtanen | 6-7,4-6 |
| Challenger de Zug | 2023/07/24 11:50 | Ergi Kirkin v Damien Wenger | 2-6,6-3,6-3 |
| Challenger de Zug | 2023/07/23 13:00 | Henri Laaksonen v Ergi Kirkin | 4-6,2-6 |
| Challenger de Tampere | 2023/07/19 10:15 | Ergi Kirkin v Kimmer Coppejans | 6-3,5-7,2-6 |
| ITF M25 Herzliya | 2023/08/09 11:25 | Amit Vales v Issei Okamura | 6-4,3-6,6-3 |
| ITF M25 Herzliya | 2023/08/08 06:30 | Issei Okamura v Eyal Shyovitz | 6-4,6-3 |
| ITF M25 Herzliya | 2023/08/07 06:30 | Issei Okamura v Raz Katz | 6-1,6-1 |
| ITF M15 Raanana | 2023/08/01 13:20 | Issei Okamura v Ofek Shimanov | 6-4,3-6,2-6 |
| ITF M15 Yakarta | 2023/06/27 05:00 | Koki Matsuda v Issei Okamura | 6-3,7-6 |
| ITF M25 Anseong | 2023/06/21 02:00 | Sanhui Shin v Issei Okamura | 6-2,6-3 |
| ITF M25 Daegu | 2023/06/05 01:00 | Issei Okamura v Chan-Yeong Oh | 1-6,6-4,7-10 |
| ITF M25 Daegu | 2023/06/04 01:00 | Issei Okamura v Jin Sung Han | 7-5,6-3 |