Stadium: Court 1 Round: 27 Ground: Clay
| Challenger Milan - HD | 2021/06/25 16:25 | Brown/Weissborn v Walkow/Zielinski | 7-5,6-4 |
| Challenger Braunschweig - HD | 2021/07/10 11:30 | Sabanov/Sabanov v Walkow/Zielinski | 4-6,6-4,4-10 |
| Challenger Braunschweig - HD | 2021/07/08 14:50 | Duran/Sandkaulen v Walkow/Zielinski | 5-7,4-6 |
| Challenger Braunschweig - HD | 2021/07/07 11:35 | Walkow/Zielinski v Cerretani/Zelenay | 6-3,6-4 |
| Challenger Milan - HD | 2021/06/25 16:25 | Brown/Weissborn v Walkow/Zielinski | 7-5,6-4 |
| Challenger Milan - HD | 2021/06/24 13:00 | Bonadio/Gabashvili v Walkow/Zielinski | 2-6,1-6 |
| Challenger Milan - HD | 2021/06/23 15:00 | Brancaccio/Zeppieri v Walkow/Zielinski | 6-7,4-6 |
| Challenger - Aix-en-Provence - HD | 2021/06/18 15:40 | Walkow/Zielinski v Doumbia/Reboul | 6-7,4-6 |
| Challenger - Aix-en-Provence - HD | 2021/06/17 09:00 | Walkow/Zielinski v Lamasine/Olivetti | 6-4,7-5 |
| ATP - Gstaad - HD | 2021/07/20 11:20 | Brown/Weissborn v Behar/Escobar | 6-4,3-6,10-7 |
| Challenger - Amersfoort - HD | 2021/07/16 16:35 | Castelnuovo/Guinard v Brown/Weissborn | 6-4,6-3 |
| Challenger - Amersfoort - HD | 2021/07/16 11:35 | Kestelboim/Mena v Brown/Weissborn | 3-6,2-6 |
| Challenger - Amersfoort - HD | 2021/07/14 17:00 | Vatutin/Vrbensky v Brown/Weissborn | 4-6,3-6 |
| Challenger Salzburg - HD | 2021/07/07 16:00 | Cerundolo/Coria v Brown/Weissborn | 6-3,0-6,11-9 |
| Challenger Milan - HD | 2021/06/26 13:30 | Brown/Weissborn v Kopriva/Lehecka | 4-6,0-6 |
| Challenger Milan - HD | 2021/06/25 16:25 | Brown/Weissborn v Walkow/Zielinski | 7-5,6-4 |
| Challenger Milan - HD | 2021/06/24 17:05 | Brown/Weissborn v Cachin/Ugo Carabelli | 6-4,6-2 |