Stadium: Court 9 Round: 54 Ground: Clay
| ITF M25 The Hague | 2021/06/27 08:00 | Marvin Netuschil v Alec Deckers | 6-4,6-2 |
| ITF M15 Bergamo | 2021/06/25 10:00 | Federico Arnaboldi v Marvin Netuschil | 7-6,6-4 |
| ITF M15 Bergamo | 2021/06/24 08:00 | Marvin Netuschil v Daniele Capecchi | 6-1,6-0 |
| ITF M15 Bergamo | 2021/06/23 09:00 | Andrea Basso v Marvin Netuschil | 6-1,2-6,2-6 |
| ITF M15 Troisdorf | 2021/05/13 13:25 | Marvin Netuschil v Sebastian Fanselow | 2-6,1-6 |
| ITF M15 Troisdorf | 2021/05/12 13:30 | Marvin Netuschil v Amaury Raynel | 6-1,6-3 |
| ITF M15 LPD Gran Canaria | 2021/04/28 09:55 | Johan Nikles v Marvin Netuschil | 6-3,6-2 |
| ITF M25 Meerbusch | 2021/04/14 10:30 | Alexander Erler v Marvin Netuschil | 6-3,6-2 |
| ITF M25 The Hague | 2021/06/27 08:00 | Max Van Wijk v Daniel De Jonge | 2-6,0-6 |
| UTR Pro Tennis Series Copenhagen | 2021/06/20 09:30 | Daniel De Jonge v Sebastian Grundtvig Jorgensen | 6-4,4-6,2-6 |
| UTR Pro Tennis Series Copenhagen | 2021/06/19 10:00 | Daniel De Jonge v Marius Ruzgas | 3-6,7-6,6-1 |
| UTR Pro Tennis Series Copenhagen | 2021/06/18 09:30 | Daniel De Jonge v Jesper Klov Nilsson | 6-3,4-6,6-3 |
| UTR Pro Tennis Series Copenhagen | 2021/06/17 08:00 | Daniel De Jonge v Nikolaj Katic | 4-6,6-4,6-0 |
| UTR Pro Tennis Series Copenhagen | 2021/06/16 08:00 | Alejandro Mendoza v Daniel De Jonge | 1-6,2-6 |
| UTR Pro Tennis Series Copenhagen | 2021/06/15 08:00 | Benjamin Hannestad v Daniel De Jonge | 4-6,5-7 |
| ITF M15 Sarreguemines | 2020/10/28 11:35 | Daniel De Jonge v Arthur Cazaux | 5-7,1-6 |