Stadium: Court 3 Round: 54 Ground: Clay
| Den Haag, Singles Qualifying M-ITF-NED-02A | 2019/07/05 14:05 | Guy Den Heijer v Geoffrey Blancaneaux | 6-4,1-6,4-6 |
| Den Haag, Singles Qualifying M-ITF-NED-02A | 2019/07/04 07:30 | Martinez, Alex v Guy Den Heijer | 2-6,2-6 |
| Den Haag, Singles Qualifying M-ITF-NED-02A | 2019/07/02 12:55 | Guy Den Heijer v Joao Lucas Reis da Silva | 6-4,6-1 |
| ITF M15 Alkmaar | 2019/06/27 10:00 | Zukas, Matias v Guy Den Heijer | 6-2,6-1 |
| ITF M15 Alkmaar | 2019/06/26 11:25 | van Den Berg, Bart v Guy Den Heijer | 2-6,7-5,2-6 |
| ITF M15 Alkmaar | 2019/06/25 09:00 | Antonescu, Vasile v Guy Den Heijer | 4-6,4-6 |
| ITF - M15 Doha | 2019/03/13 12:00 | Jesper De Jong v Guy Den Heijer | 7-5,6-4 |
| ITF - M15 Doha | 2019/03/12 13:30 | Konecny, Michal v Guy Den Heijer | 6-4,6-7,3-6 |
| ITF Germany F15 | 2018/10/10 09:00 | Kenzlers, Julian v Karlo Cubelic | 1-6,1-6 |
| ITF Germany F15 | 2018/10/08 08:00 | Matuszewski, Piotr v Kenzlers, Julian | 1-6,3-6 |
| ITF Germany F9 | 2017/07/30 08:00 | Van Terheijden, Tim v Kenzlers, Julian | 6-0,6-1 |