Stadium: Court 4 Round: 25 Ground: Clay
| 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 - M15 Doha | 2019/03/11 13:55 | Manole, Alexandru Vasile v Guy Den Heijer | 2-6,1-6 |
| ITF - M15 Doha | 2019/03/11 09:45 | Bencic, Brian v Guy Den Heijer | 4-6,1-6 |
| ITF - M15 Doha | 2019/03/07 12:00 | Guy Den Heijer v Rodriguez-Pace, Ricardo | 4-6,3-6 |
| ITF M15 Alkmaar | 2019/06/27 14:50 | Enrico Dalla Valle v Joao Lucas Reis da Silva | 6-4,6-2 |
| ITF M15 Alkmaar | 2019/06/26 16:05 | Veldheer, Mick v Joao Lucas Reis da Silva | 2-6,0-6 |
| Balatonalmadi, Singles Qualifying M-ITF-HUN-02A | 2019/06/18 08:00 | Joao Lucas Reis da Silva v Semjan, Marek | 3-6,4-6 |
| Balatonalmadi, Singles Qualifying M-ITF-HUN-02A | 2019/06/17 10:30 | Joao Lucas Reis da Silva v Voros, Mate | 6-0,6-1 |
| Kaltenkirchen, Singles Qualifying M-ITF-GER-05A | 2019/06/11 16:10 | Eriksson, Markus v Joao Lucas Reis da Silva | 7-6,6-2 |
| Karlsruhe, Singles M-ITF-GER-04A | 2019/06/05 13:55 | Daniel Dutra Da Silva v Joao Lucas Reis da Silva | 6-4,6-2 |
| Karlsruhe, Singles M-ITF-GER-04A | 2019/06/04 09:00 | Oscar Jose Gutierrez v Joao Lucas Reis da Silva | 1-6,2-6 |
| Karlsruhe, Singles M-ITF-GER-04A | 2019/06/03 09:00 | Erlenbusch, Luis v Joao Lucas Reis da Silva | 2-6,6-1,8-10 |