Stadium: Court 1 Round: 62 Ground: Clay
| ITF M25 Marburg | 2021/07/07 10:50 | Aleksandre Metreveli v Guy Den Heijer | 6-3,1-6,6-2 |
| ITF M25 Marburg | 2021/07/06 12:25 | Guy Den Heijer v Florian Broska | 6-3,7-6 |
| ITF M25 Marburg | 2021/07/05 08:00 | Guy Den Heijer v Maximilian Homberg | 6-7,6-2,10-8 |
| ITF M25 The Hague | 2021/06/29 15:00 | Dayne Kelly v Guy Den Heijer | 6-1,6-4 |
| ITF M25 The Hague | 2021/06/28 09:40 | Guy Den Heijer v Max Van Nunen | 6-3,6-1 |
| ITF M25 The Hague | 2021/06/27 08:00 | Guy Den Heijer v Jing L Weng | 6-3,6-4 |
| ITF M25 Alkmaar | 2021/06/23 09:00 | Kaichi Uchida v Guy Den Heijer | 7-6,6-3 |
| ITF M25 Alkmaar | 2021/06/21 18:00 | Vladimir Ivanov v Guy Den Heijer | 3-6,6-7 |
| ITF M15 Monastir | 2021/06/28 14:00 | Kazuma Kawachi v Vladislav Ivanov | 1-6,6-4,10-6 |
| ITF M15 Monastir | 2021/06/28 09:00 | Mhamed Affes v Vladislav Ivanov | 0-6,1-6 |
| ITF M15 Monastir | 2021/06/27 11:30 | Samir Hamza Reguig v Vladislav Ivanov | 3-6,1-6 |
| ITF M15 Monastir | 2021/06/20 12:00 | Alec Beckley v Vladislav Ivanov | 6-4,7-5 |
| ITF M15 Monastir | 2021/06/14 09:00 | Keenan Mayo v Vladislav Ivanov | 6-4,6-4 |
| ITF M15 Monastir | 2021/06/13 08:00 | Vicente O Moratalla v Vladislav Ivanov | 2-6,4-6 |
| ITF M15 Antalya | 2021/06/08 07:00 | Damien Wenger v Vladislav Ivanov | 6-4,6-3 |
| ITF M15 Antalya | 2021/06/07 07:00 | Fernando A. Z. Cantillana v Vladislav Ivanov | 1-6,0-6 |