Stadium: Court 2 Round: 26 Ground: Clay
| Challenger Rennes - Herrdubbel | 2021/09/16 09:00 | Hermans/Smits v Stevens/Van Rijthoven | 3-6,2-6 |
| Challenger Rennes - Herrdubbel | 2021/09/15 09:30 | Hermans/Smits v Chandrasekar/Pozzi | 6-1,6-3 |
| Challenger Todi - Herrdubbel | 2021/07/15 13:00 | Vervoort/Zeballos v Hermans/Smits | 5-7,7-5,10-8 |
| Challenger Todi - Herrdubbel | 2021/07/14 19:00 | Hermans/Smits v P De Almeida/Sakamoto | 7-6,7-5 |
| ITF M25 - Alkmaar - Herrdubbel | 2021/06/24 18:50 | Hermans/Smits v De Jong/Jong | 6-7,1-6 |
| ITF M25 - Alkmaar - Herrdubbel | 2021/06/22 14:20 | Hermans/Smits v de Krom/Den Heijer | 6-7,6-3,10-5 |
| ITF M15 - Troisdorf - Herrdubbel | 2021/05/14 13:35 | Galarza/Paz v Hermans/Smits | 6-3,3-6,10-4 |
| ITF M15 - Troisdorf - Herrdubbel | 2021/05/13 15:45 | Bertola/Lipovsek Puches v Hermans/Smits | 6-7,4-6 |