Stadium: EMS Court Round: 27 Ground: Clay
| Challenger Braunschweig MD | 2021/07/10 11:30 | Sabanov/Sabanov v Walkow/Zielinski | 4-6,6-4,4-10 |
| Challenger Prague MD | 2021/05/04 15:40 | Walkow/Zielinski v Sabanov/Sabanov | 6-3,3-6,5-10 |
| Challenger Meerbusch MD | 2021/08/11 13:00 | Ficovich/Kicker v Walkow/Zielinski | 3-6,2-6 |
| Challenger Poznan MD | 2021/07/29 16:25 | Gonzales/Johnson v Walkow/Zielinski | 2-6,7-6,13-11 |
| Challenger Poznan MD | 2021/07/28 14:10 | Domingues/Elias v Walkow/Zielinski | 2-6,2-6 |
| ATP Gstaad MD | 2021/07/25 11:20 | Huesler/Stricker v Walkow/Zielinski | 6-1,7-6 |
| ATP Gstaad MD | 2021/07/23 10:45 | Paul/Riedi v Walkow/Zielinski | 6-4,6-7,2-10 |
| ATP Gstaad MD | 2021/07/22 09:00 | Walkow/Zielinski v Brown/Weissborn | 6-4,6-7,10-7 |
| Challenger Braunschweig MD | 2021/07/10 11:30 | Sabanov/Sabanov v Walkow/Zielinski | 4-6,6-4,4-10 |
| Challenger Braunschweig MD | 2021/07/08 14:50 | Duran/Sandkaulen v Walkow/Zielinski | 5-7,4-6 |
| Challenger Meerbusch MD | 2021/08/10 13:45 | Bobrov/Safiullin v Sabanov/Sabanov | 2-6,6-7 |
| ATP Umag MD | 2021/07/23 18:50 | Brkic/Cacic v Sabanov/Sabanov | 6-1,6-2 |
| ATP Umag MD | 2021/07/22 15:30 | Sabanov/Sabanov v Dzumhur/Sancic | 7-5,6-0 |
| ATP Umag MD | 2021/07/19 18:45 | Martinez/Sitak v Sabanov/Sabanov | 6-3,6-7,6-10 |
| ATP Hamburg MD | 2021/07/15 12:00 | Cerretani/Verdugo v Sabanov/Sabanov | 6-4,6-3 |
| ATP Hamburg MD | 2021/07/14 13:45 | Sabanov/Sabanov v Gille/Sharan | 6-3,6-4 |
| Challenger Braunschweig MD | 2021/07/10 11:30 | Sabanov/Sabanov v Walkow/Zielinski | 4-6,6-4,4-10 |
| Challenger Braunschweig MD | 2021/07/09 10:00 | Sabanov/Sabanov v Sijsling/Smits | 6-1,6-2 |