Stadium: Court 8 Round: 54 Ground: Clay
| ITF - M15 Antalya | 2023/04/02 07:00 | Guy Den Heijer v Niels Visker | 1-6,6-4,3-10 |
| ITF - M25 Santa Margherita | 2023/09/24 08:00 | Niels Visker v Daniele Minighini | 6-1,3-6,10-3 |
| ITF - M25 Santa Margherita | 2023/09/18 13:00 | Niels Visker v Sidane Pontjodikromo | 7-5,4-6,2-6 |
| ITF - M15 Buschhausen | 2023/09/14 10:00 | Niels Visker v Hazem Naw | 4-6,6-7 |
| ITF - M15 Buschhausen | 2023/09/12 11:40 | Niels Visker v David Fix | 6-1,6-3 |
| ITF - M15 Haren | 2023/09/08 11:00 | Brian Bozemoj v Niels Visker | 6-3,6-7,7-5 |
| ITF - M15 Haren | 2023/09/07 12:20 | Niels Visker v Andrea Bolla | 4-6,6-3,6-4 |
| ITF - M15 Haren | 2023/09/06 17:30 | Niels Visker v Jarno Jans | 6-1,6-3 |
| ITF - M15 Frankfurt Am Main | 2023/08/09 10:15 | Lucas Gerch v Niels Visker | 6-0,6-1 |
| ITF - M25 Santa Margherita | 2023/09/24 08:00 | Niccolo Ciavarella v Guy Den Heijer | 6-2,3-6,7-10 |
| ITF - M25 Santa Margherita | 2023/09/18 08:30 | Guy Den Heijer v Toby Martin | 5-7,6-3,7-10 |
| ITF - M15 Haren | 2023/09/07 17:25 | Guy Den Heijer v Adrian Oetzbach | 6-7,6-7 |
| ITF - M15 Haren | 2023/09/05 17:30 | Guy Den Heijer v Kjell De Hek | 6-3,6-1 |
| ITF - M25 Oldenzaal | 2023/08/30 18:10 | Aleksandr Braynin v Guy Den Heijer | 4-6,7-6,7-5 |
| ITF - M25 Lesa | 2023/08/24 18:45 | Clement Tabur v Guy Den Heijer | 6-1,6-4 |
| ITF - M25 Lesa | 2023/08/21 13:00 | Guy Den Heijer v Giuseppe La Vela | 4-6,2-6 |
| ITF - M15 Eindhoven | 2023/07/31 08:00 | Guy Den Heijer v Daniel De Jonge | 6-7,7-5,11-13 |