Stadium: Court 2 Round: 26 Ground: Hardcourt indoor
| ITF M15 Selva Gardena | 2023/10/30 13:20 | Massimo Giunta v Kai Lemstra | 2-6,4-6 |
| ITF M15 Bad Waltersdorf | 2023/10/05 07:30 | Kai Lemstra v Vlad Andrei Dancu | 1-6,1-6 |
| ITF M15 Bad Waltersdorf | 2023/10/03 07:20 | Jakub Filip v Kai Lemstra | 0-6,0-6 |
| ITF M15 Satu Mare | 2023/09/14 10:35 | Stefan Palosi v Kai Lemstra | 6-4,7-6 |
| ITF M15 Satu Mare | 2023/09/13 09:25 | Kai Lemstra v Simone Agostini | 6-3,6-4 |
| ITF M15 Haren | 2023/09/08 16:05 | Kai Lemstra v Thiemo De Bakker | 3-6,6-7 |
| ITF M15 Haren | 2023/09/07 09:00 | Svyatoslav Gulin v Kai Lemstra | 3-6,6-7 |
| ITF M15 Haren | 2023/09/06 11:30 | Kai Lemstra v Mika Lipp | 6-3,6-4 |
| ITF M15 Selva Gardena | 2023/10/31 18:30 | Jonas Trinker v Hynek Barton | 4-6,4-6 |
| Challenger Ortisei | 2023/10/25 12:15 | Hynek Barton v Billy Harris | 2-6,6-7 |
| Challenger Ortisei | 2023/10/24 08:00 | Hynek Barton v David Jorda Sanchis | 6-7,7-6,6-3 |
| Challenger Ortisei | 2023/10/23 08:00 | Patrik Rikl v Hynek Barton | 6-3,6-7,4-6 |
| Challenger Ortisei | 2023/10/22 08:00 | Alessandro Pecci v Hynek Barton | 7-6,3-6,4-6 |
| ITF M25 Edgbaston | 2023/10/17 12:05 | Hynek Barton v Kyle Edmund | 1-6,2-6 |
| ITF M25 Pazardzhik | 2023/09/29 07:00 | Hynek Barton v Max Houkes | 3-6,2-6 |
| ITF M25 Pazardzhik | 2023/09/28 07:00 | Hynek Barton v Jonas Forejtek | 6-4,6-2 |