Stadium: Court 2 Round: 27 Ground: Clay
| Challenger Warsaw MD | 2021/08/27 16:20 | Lenz/Verbeek v Erler/Miedler | 6-7,6-2,10-5 |
| Challenger Luedenscheid MD | 2021/08/18 16:15 | Molchanov/Nedovyesov v Lenz/Verbeek | 6-4,7-5 |
| Challenger Warsaw MD | 2021/08/25 16:35 | Heyman/Vanneste v Arneodo/Molchanov | 6-1,5-7,6-10 |