Stadium: Court 2 Round: 25 Ground: Clay
| Challenger Ismaning | 2022/10/09 16:45 | Kacper Zuk v David Fix | 6-1,6-3 |
| ITF M15 Uberlingen | 2022/08/16 14:05 | David Fix v Christoph Negritu | 3-6,3-6 |
| ITF M15 Oberhaching | 2022/02/13 08:00 | David Fix v Yannick Wunderlich | 6-3,5-7,7-10 |
| ITF M25 Ueberlingen | 2021/08/18 11:20 | David Fix v Fabrizio Ornago | 2-6,2-6 |
| ITF M15 Saarlouis | 2023/06/19 09:30 | Max Wiskandt v Guy Den Heijer | 4-6,2-6 |
| ITF M15 Saarlouis | 2023/06/18 09:00 | Gian Luca Tanner v Guy Den Heijer | 6-3,2-6,8-10 |
| UTR Pro Hilversum | 2023/06/06 06:00 | Guy Den Heijer v Victor Sklenka | 7-6,4-6,5-3 |
| UTR Pro Hilversum | 2023/06/05 07:30 | Guy Den Heijer v Ivan Sergeyev | 0-6,2-6 |
| ITF M15 Antalya | 2023/04/30 07:00 | Guy Den Heijer v Juan Manuel La Serna | 6-7,1-6 |
| ITF M15 Antalya | 2023/04/02 07:00 | Guy Den Heijer v Niels Visker | 1-6,6-4,3-10 |
| ITF M25 Portimao | 2023/03/14 11:00 | Guy Den Heijer v Mikel Martinez | 1-6,2-6 |
| ITF M25 Portimao | 2023/03/13 15:35 | Guy Den Heijer v Miguel Pereira Lopes | 6-1,6-3 |