Stadium: Hard 21 Round: 25 Ground: Hardcourt outdoor
| UTR Pro Tennis Series Amsterdam | 2021/11/07 10:30 | Guy Den Heijer v Sem Verbeek | 6-3,6-3 |
| UTR Pro Tennis Series Amsterdam | 2021/11/06 12:00 | Deney Wassermann v Guy Den Heijer | 2-6,5-6 |
| UTR Pro Tennis Series Amsterdam | 2021/11/05 13:30 | Guy Den Heijer v Johann Willems | 7-6,2-6,6-4 |
| UTR Pro Tennis Series Amsterdam | 2021/11/03 10:30 | Guy Den Heijer v Lawrence Bataljin | 6-0,6-3 |
| UTR Pro Tennis Series Amsterdam | 2021/11/02 10:30 | Guy Den Heijer v Jip Van Assendelft | 6-4,5-2 |
| UTR Pro Tennis Series Amsterdam | 2021/11/01 13:30 | Miko Wassermann v Guy Den Heijer | 2-6,5-7 |
| ITF M15 Girona | 2021/10/19 08:00 | Guy Den Heijer v Vladislav Ivanov | 6-4,6-3 |
| ITF M15 Girona | 2021/10/18 08:00 | Guy Den Heijer v Samir Hamza Reguig | 6-2,6-1 |
| UTR Pro Tennis Series Amsterdam | 2021/11/07 12:00 | Max Houkes v Amadatus Admiraal | 6-0,6-4 |
| UTR Pro Tennis Series Amsterdam | 2021/11/06 10:30 | Max Houkes v Miko Wassermann | 6-4,6-3 |
| UTR Pro Tennis Series Amsterdam | 2021/11/05 12:00 | Teun Rozenberg v Max Houkes | 7-6,2-6,3-6 |
| UTR Pro Tennis Series Amsterdam | 2021/11/04 09:00 | Nathan De Veer v Max Houkes | 0-6,6-4,6-3 |
| UTR Pro Tennis Series Amsterdam | 2021/11/03 13:30 | Maxence Broville v Max Houkes | 6-3,6-4 |
| UTR Pro Tennis Series Amsterdam | 2021/11/01 12:00 | Thorsten Sollie v Max Houkes | 2-6,7-5,0-5 |
| ITF M15 Platja D'Aro | 2021/10/14 09:00 | Max Houkes v Max Alcala Gurri | 6-7,7-5,4-6 |
| ITF M15 Platja D'Aro | 2021/10/13 10:30 | David Jorda Sanchis v Max Houkes | 4-6,4-6 |