Stadium: Court 17 Round: 62 Ground: Clay
| ITF M15 Heraklion | 2019/11/27 09:30 | Leopold Zima v Guy Den Heijer | 3-6,0-6 |
| ITF M15 Antalya | 2021/01/29 07:00 | Timur Kiyamov v Guy Den Heijer | 4-6,3-6 |
| ITF M15 Antalya | 2021/01/29 07:00 | Joao Lucas Reis da Silva v Guy Den Heijer | 6-3,6-3 |
| ITF M15 Antalya | 2021/01/28 07:00 | Mark Tryakshin v Guy Den Heijer | 2-6,1-6 |
| ITF M15 Alkmaar | 2020/08/23 14:30 | Guy Den Heijer v Leon Hoeveler | 6-2,6-3 |
| ITF M15 Loule | 2020/03/12 14:05 | Evan Hoyt v Guy Den Heijer | 6-2,5-7,1-6 |
| ITF M15 Loule | 2020/03/10 13:25 | Alexis Boureau v Guy Den Heijer | 3-6,3-6 |
| ITF M15 Faro | 2020/03/05 12:00 | Tiago Cacao v Guy Den Heijer | 6-2,6-2 |
| ITF M15 Faro | 2020/03/04 14:20 | Guy Den Heijer v Afonso Salgado | 6-3,6-3 |
| ITF M15 Antalya | 2021/01/31 07:50 | Georgii Kravchenko v Leopold Zima | 6-3,6-4 |
| ITF M15 Antalya | 2021/01/29 07:00 | Leopold Zima v Stefan Popovic | 6-2,6-2 |
| ITF M15 Antalya | 2021/01/29 06:30 | Jonathan Mridha v Leopold Zima | 2-6,6-2,1-10 |
| ITF M15 Antalya | 2021/01/28 08:00 | Leopold Zima v Simon A Ivanov | 6-4,7-5 |
| ITF M15 Antalya | 2021/01/18 09:00 | Alexandar Lazarov v Leopold Zima | 6-2,6-1 |
| ITF M15 Antalya | 2021/01/17 09:00 | Leopold Zima v Charles Minc | 6-1,6-1 |
| ITF M15 Antalya | 2021/01/12 07:00 | Alessandro Ragazzi v Leopold Zima | 6-2,6-2 |
| ITF M15 Antalya | 2021/01/11 07:00 | Michalis Sakellaridis v Leopold Zima | 1-6,5-7 |