Stadium: Court 10 Round: 25 Ground: Clay
| ITF M15 Gdynia | 2021/08/10 08:00 | Juliusz Bienkiewicz v Daniel De Jonge | 2-6,6-7 |
| ITF M15 Gdynia | 2021/08/09 08:00 | Sergo Sikharulidze v Daniel De Jonge | 3-6,2-6 |
| ITF M15 Gdynia | 2021/08/08 08:00 | Valerio Aboian v Daniel De Jonge | 5-7,6-7 |
| ITF M15 Frederiksberg | 2021/08/05 10:25 | Christian Sigsgaard v Daniel De Jonge | 6-4,7-6 |
| ITF M15 Frederiksberg | 2021/08/03 09:20 | Daniel De Jonge v Patrick Kypson | 6-3,7-6 |
| ITF M25 Marburg | 2021/07/05 12:05 | Patrick Zahraj v Daniel De Jonge | 6-3,6-2 |
| ITF M25 The Hague | 2021/07/01 07:30 | Tepavac, Marko v Daniel De Jonge | 7-5,6-1 |
| ITF M25 The Hague | 2021/06/27 08:00 | van Wijk, Max v Daniel De Jonge | 2-6,0-6 |
| ITF M15 Frederiksberg | 2021/08/08 10:00 | Eriksson, Markus v Jonathan Mridha | 3-6,6-7 |
| ITF M15 Frederiksberg | 2021/08/07 11:05 | Eriksson, Markus v August Holmgren | 6-3,3-6,6-4 |
| ITF M15 Frederiksberg | 2021/08/06 10:50 | Eriksson, Markus v Kirkov, Vasil | 6-4,6-3 |
| ITF M15 Frederiksberg | 2021/08/05 10:20 | Eriksson, Markus v Slavic, Nikola | 6-3,6-1 |
| ITF M15 Frederiksberg | 2021/08/03 13:05 | Eriksson, Markus v George Loffhagen | 6-7,6-2,6-2 |
| Challenger Tampere | 2021/07/18 08:00 | Bogdan Bobrov v Eriksson, Markus | 7-6,6-4 |
| ATP Bastad | 2021/07/11 09:00 | Eriksson, Markus v Fabbiano, Thomas | 6-7,4-6 |
| ITF M25 Bourg-en-Bresse | 2021/07/01 08:30 | Eriksson, Markus v Clement Tabur | 6-7,6-7 |