Round: 25 Ground: Clay
| ITF - M15 Skopje | 2021/06/09 12:20 | Alexis Gautier v Max Houkes | 7-6,6-4 |
| ITF - M15 Skopje | 2021/06/08 09:00 | Max Houkes v Taiyo Yamanaka | 6-4,6-3 |
| ITF - M15 Skopje | 2021/06/07 09:00 | Max Houkes v Aloys J W Van Baal | 6-2,6-2 |
| ITF - M15 Skopje | 2021/06/06 12:00 | Max Houkes v Simeon Terziev | 6-1,6-4 |
| ITF - M15 Skopje | 2021/05/31 09:30 | Max Houkes v Rrezart Cungu | 6-7,3-6 |
| ITF - M15 Majadahonda | 2021/05/05 09:25 | Max Houkes v Oriol Roca Batalla | 0-6,6-2,2-6 |
| ITF - M15 Majadahonda | 2021/05/03 14:00 | Max Houkes v Diego A B Sanchez | 6-1,1-6,10-5 |
| ITF - M15 Majadahonda | 2021/05/03 10:45 | Max Houkes v Marco De Rossi | 6-2,6-4 |
| ITF - M25 Haga | 2021/07/02 14:30 | Jelle Sels v Christopher Heyman | 6-3,6-0 |
| ITF - M25 Haga | 2021/07/01 11:40 | Christopher Heyman v Jesper De Jong | 6-4,7-5 |
| ITF - M25 Haga | 2021/06/30 12:15 | Raphael Collignon v Christopher Heyman | 1-6,7-6,3-6 |
| ITF - M25 Alkmaar | 2021/06/26 13:35 | Nicolas Alvarez Varona v Christopher Heyman | 6-4,3-6,7-6 |
| ITF - M25 Alkmaar | 2021/06/25 11:45 | Christopher Heyman v Gijs Brouwer | 6-4,6-4 |
| ITF - M25 Alkmaar | 2021/06/24 09:00 | Kaichi Uchida v Christopher Heyman | 2-6,6-3,6-7 |
| ITF - M25 Alkmaar | 2021/06/22 09:00 | Christopher Heyman v Alexander Shevchenko | 7-6,6-2 |
| ITF - M15 Antalya | 2021/06/17 07:30 | Francisco Comesana v Christopher Heyman | 6-4,6-3 |