Estádio: Court 1 Round: 26 Ground: Clay
| ITF - M25 Tainan | 2023/08/16 02:00 | Ergi Kirkin v Issei Okamura | 6-0,6-2 |
| Challenger - Meerbusch | 2023/08/10 13:05 | Ergi Kirkin v Camilo Ugo Carabelli | 1-6,4-6 |
| Challenger - Meerbusch | 2023/08/09 09:55 | Ergi Kirkin v Rudolf Molleker | 6-4,7-6 |
| Challenger - Meerbusch | 2023/08/07 15:00 | Ergi Kirkin v John Sperle | 7-6,6-3 |
| Challenger - Meerbusch | 2023/08/06 15:40 | Ergi Kirkin v Marcelo Zormann | 6-3,6-1 |
| Challenger - Zug | 2023/07/25 12:05 | Ergi Kirkin v Otto Virtanen | 6-7,4-6 |
| Challenger - Zug | 2023/07/24 11:50 | Ergi Kirkin v Damien Wenger | 2-6,6-3,6-3 |
| Challenger - Zug | 2023/07/23 13:00 | Henri Laaksonen v Ergi Kirkin | 4-6,2-6 |
| 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 Changwon | 2023/06/15 01:00 | Naoki Tajima v Chan-Yeong Oh | 1-6,3-6 |
| ITF - M25 Changwon | 2023/06/12 04:30 | Naoki Tajima v Hyun Woo Cho | 6-1,6-0 |