| ITF M15 Almada | 2021/07/07 08:30 | Michiel de Krom v Duarte Vale | 3-6,3-6 |
| ITF M25 The Hague | 2021/06/28 08:45 | Carlos Lopez Montagud v Michiel de Krom | 6-1,6-3 |
| ITF M25 The Hague | 2021/06/27 08:00 | Tom Clavel v Michiel de Krom | 3-6,5-7 |
| ITF M25 Alkmaar | 2021/06/21 17:30 | Marvin Moeller v Michiel de Krom | 2-6,6-4,10-3 |
| ITF M25 Alkmaar | 2021/06/20 17:00 | Constantin Bittoun Kouzmine v Michiel de Krom | 3-6,3-6 |
| ITF M15 Valldoreix | 2021/05/09 14:00 | Michiel de Krom v Federico Iannaccone | 3-6,2-6 |
| ITF M15 Majadahonda | 2021/05/05 06:55 | Martin Cuevas v Michiel de Krom | 7-5,6-3 |
| ITF M25 Reus | 2021/04/13 10:00 | Yan Bondarevskiy v Michiel de Krom | 6-3,6-3 |
| ITF M15 Curtea de Arges | 2021/08/09 07:00 | Vlad Cristian Breazu v Vlad Andrei Dancu | 2-6,1-6 |
| UTR Pro Tennis Series Bucharest | 2021/06/03 10:30 | Vlad Stoica v Vlad Cristian Breazu | 6-3,6-4 |
| UTR Pro Tennis Series Bucharest | 2021/06/02 15:00 | Bogdan Borza v Vlad Cristian Breazu | 7-6,6-3 |
| UTR Pro Tennis Series Bucharest | 2021/06/02 11:30 | Radu Mihai Papoe v Vlad Cristian Breazu | 7-6,6-0 |
| UTR Pro Tennis Series Bucharest | 2021/05/30 08:00 | Vlad Cristian Breazu v Vlad Stoica | 6-3,6-1 |
| ITF M15 Bucharest | 2021/05/23 07:00 | Vlad Cristian Breazu v Vlad Andrei Dumitru | 3-6,1-6 |