Stadium: Court Central Round: 26 Ground: Hardcourt indoor
| US Open MD | 2021/09/04 19:20 | Golubev/Mies v Brkic/Cacic | 7-5,6-2 |
| US Open MD | 2021/09/02 20:45 | Cuevas/Mannarino v Brkic/Cacic | 7-6,2-6,4-6 |
| ATP Winston-Salem MD | 2021/08/23 18:00 | Brkic/Cacic v Mahut/Martin | 4-6,1-6 |
| ATP Kitzbuhel MD | 2021/07/30 08:30 | Brkic/Cacic v Erler/Miedler | 6-1,1-6,10-12 |
| ATP Kitzbuhel MD | 2021/07/28 13:05 | Brkic/Cacic v Matos/Vasilevski | 7-6,2-6,10-8 |
| 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 |