Stadium: Grandstand Round: 27 Ground: Clay
| ATP Kitzbuhel MD | 2021/07/27 13:15 | Brkic/Cacic v Pel/Rinderknech | 6-2,6-3 |
| ATP Umag MD | 2021/07/24 21:50 | Brkic/Cacic v Romboli/Vega Hernandez | 3-6,5-7 |
| ATP Umag MD | 2021/07/23 18:50 | Brkic/Cacic v Sabanov/Sabanov | 6-1,6-2 |
| 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 |
| ATP Kitzbuhel MD | 2021/07/26 09:00 | Matos/Vasilevski v Cecchinato/Travaglia | 6-3,7-5 |
| ATP Umag MD | 2021/07/20 19:15 | Cecchinato/Travaglia v Matos/Vasilevski | 7-5,6-4 |