Stadium: Court 4 Round: 25 Ground: Clay
| ITF M15 - Alkmaar | 2019/06/27 10:00 | Matias Zukas v Guy Den Heijer | 6-2,6-1 |
| ITF M15 - Alkmaar | 2019/06/26 11:25 | Bart Van Den Berg v Guy Den Heijer | 2-6,7-5,2-6 |
| ITF M15 - Alkmaar | 2019/06/25 09:00 | Vasile Antonescu 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 | Michal Konecny v Guy Den Heijer | 6-4,6-7,3-6 |
| ITF M15 - Doha | 2019/03/11 13:55 | Alexandru Vasile Manole v Guy Den Heijer | 2-6,1-6 |
| ITF M15 - Doha | 2019/03/11 09:45 | Brian Bencic v Guy Den Heijer | 4-6,1-6 |
| ITF M15 - Doha | 2019/03/07 12:00 | Guy Den Heijer v Ricardo Rodriguez-Pace | 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 | Mick Veldheer v Joao Lucas Reis da Silva | 2-6,0-6 |
| ITF M15 - Balatonalmadi | 2019/06/18 08:00 | Joao Lucas Reis da Silva v Marek Semjan | 3-6,4-6 |
| ITF M15 - Balatonalmadi | 2019/06/17 10:30 | Joao Lucas Reis da Silva v Mate Voros | 6-0,6-1 |
| ITF M15 - Kaltenkirchen | 2019/06/11 16:10 | Markus Eriksson v Joao Lucas Reis da Silva | 7-6,6-2 |
| ITF M25 - Karlsruhe | 2019/06/05 13:55 | Daniel Dutra Da Silva v Joao Lucas Reis da Silva | 6-4,6-2 |
| ITF M25 - Karlsruhe | 2019/06/04 09:00 | Oscar Jose Gutierrez v Joao Lucas Reis da Silva | 1-6,2-6 |
| ITF M25 - Karlsruhe | 2019/06/03 09:00 | Luis Erlenbusch v Joao Lucas Reis da Silva | 2-6,6-1,8-10 |