Stadium: Indoor 6 Round: 28 Ground: Clay
| Challenger Braga MD | 2021/09/23 10:25 | Bobrov/Ortega-Olmedo v de Jong/Stevens | 3-6,3-6 |
| Challenger Braga MD | 2021/09/22 13:50 | Daniel/De Loore v de Jong/Stevens | 4-6,7-5,3-10 |
| Challenger Meerbusch MD | 2021/08/13 09:00 | de Jong/Stevens v Walkow/Zielinski | 2-6,7-6,9-11 |
| Challenger Meerbusch MD | 2021/08/12 11:30 | Ajdukovic/Fatic v de Jong/Stevens | 0-6,2-6 |
| Challenger Meerbusch MD | 2021/08/11 09:30 | de Jong/Stevens v Begemann/Olivetti | 6-4,7-5 |
| Challenger Amersfoort MD | 2021/07/13 12:50 | de Jong/Stevens v De Jonge/Ouden | 4-6,6-7 |
| ITF M25 The Hague MD | 2021/07/03 12:55 | de Jong/Stevens v Brouwer/Sels | 6-3,6-4 |
| ITF M25 The Hague MD | 2021/07/02 15:50 | de Jong/Stevens v Nijboer/Veldheer | 7-6,6-2 |
| Challenger Braga MD | 2021/09/23 09:00 | Hermans/Sijsling v Heller/Vanneste | 6-4,7-5 |
| Challenger Braga MD | 2021/09/21 13:50 | Hermans/Sijsling v Arnaboldi/Zeppieri | 6-4,2-6,12-10 |