Stadium: Grandstand Round: 28 Ground: Clay
| ATP Belgrade MD | 2021/05/23 15:20 | Sabanov/Sabanov v Brkic/Cacic | 4-6,6-3,10-8 |
| ATP Umag MD | 2021/07/22 18:45 | Brkic/Cacic v Jebavy/Vesely | 6-2,6-2 |
| ATP Umag MD | 2021/07/21 19:40 | Brkic/Cacic v Ajdukovic/Nincevic | 6-4,3-6,10-8 |
| ATP Hamburg MD | 2021/07/14 10:30 | Golubev/Nedovyesov v Brkic/Cacic | 6-3,7-6 |
| Wimbledon MD | 2021/07/05 12:15 | Mektic/Pavic v Brkic/Cacic | 6-2,3-6,7-6,6-4 |
| Wimbledon MD | 2021/07/03 10:00 | Brkic/Cacic v Daniell/Oswald | 6-3,1-6,13-12 |
| Wimbledon MD | 2021/07/02 13:30 | Brkic/Cacic v Gerasimov/Nishioka | 7-6,6-4 |
| ATP Mallorca MD | 2021/06/22 14:40 | Djokovic/Gomez-Herrera v Brkic/Cacic | 5-7,6-4,13-11 |
| ATP Halle MD | 2021/06/16 09:00 | Brkic/Cacic v Krawietz/Tecau | 6-7,3-6 |
| 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 |
| 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 |