Stadium: Center Court Round: 29 Ground: Clay
| Challenger Praga - MD | 2021/05/04 15:40 | Walkow/Zielinski v Sabanov/Sabanov | 6-3,3-6,5-10 |
| Challenger Braunschweig - MD | 2021/07/09 10:00 | Sabanov/Sabanov v Sijsling/Smits | 6-1,6-2 |
| Challenger Braunschweig - MD | 2021/07/07 15:50 | Sabanov/Sabanov v Gengel/Langmajer | 6-1,4-6,10-3 |
| Challenger Bratislava - MD | 2021/06/10 09:00 | Luz/Matos v Sabanov/Sabanov | 6-2,6-3 |
| Challenger Bratislava - MD | 2021/06/09 08:30 | Palovic/Pokorny v Sabanov/Sabanov | 2-6,5-7 |
| ATP Belgrad - MD | 2021/05/27 12:55 | Sabanov/Sabanov v Erlich/Vasilevski | 3-6,6-3,11-13 |
| ATP Belgrad - MD | 2021/05/26 15:50 | Delbonis/Sitak v Sabanov/Sabanov | 2-6,1-6 |
| ATP Belgrad - MD | 2021/05/23 15:20 | Sabanov/Sabanov v Brkic/Cacic | 4-6,6-3,10-8 |
| Challenger Heilbronn - MD | 2021/05/12 13:30 | Matos/M R Alves v Sabanov/Sabanov | 6-3,6-0 |
| Challenger Braunschweig - MD | 2021/07/08 14:50 | Duran/Sandkaulen v Walkow/Zielinski | 5-7,4-6 |
| Challenger Braunschweig - MD | 2021/07/07 11:35 | Walkow/Zielinski v Cerretani/Zelenay | 6-3,6-4 |
| Challenger Milan - MD | 2021/06/25 16:25 | Brown/Weissborn v Walkow/Zielinski | 7-5,6-4 |
| Challenger Milan - MD | 2021/06/24 13:00 | Bonadio/Gabashvili v Walkow/Zielinski | 2-6,1-6 |
| Challenger Milan - MD | 2021/06/23 15:00 | Brancaccio/Zeppieri v Walkow/Zielinski | 6-7,4-6 |
| Challenger Aix en Provence - MD | 2021/06/18 15:40 | Walkow/Zielinski v Doumbia/Reboul | 6-7,4-6 |
| Challenger Aix en Provence - MD | 2021/06/17 09:00 | Walkow/Zielinski v Lamasine/Olivetti | 6-4,7-5 |
| Challenger Aix en Provence - MD | 2021/06/16 11:20 | Matos/Molchanov v Walkow/Zielinski | 0-6,7-6,8-10 |