Stadium: Court 2 Round: 26 Ground: Hardcourt indoor
| ATP Sofia MD | 2021/10/01 09:00 | Gonzalez/Molteni v Brkic T / Cacic N | 6-7,6-2,10-4 |
| ATP Sofia MD | 2021/09/29 10:40 | Golubev A / Nedovyesov A v Brkic T / Cacic N | 3-6,7-6,7-10 |
| ATP Metz MD | 2021/09/24 13:35 | Nys/Rinderknech v Brkic T / Cacic N | 6-3,7-6 |
| ATP Metz MD | 2021/09/23 14:10 | Reese/Verbeek v Brkic T / Cacic N | 3-6,3-6 |
| ATP Metz MD | 2021/09/22 10:00 | Giron/Olivetti v Brkic T / Cacic N | 4-6,7-6,1-10 |
| US Open MD | 2021/09/04 19:20 | Golubev/Mies v Brkic T / Cacic N | 7-5,6-2 |
| US Open MD | 2021/09/02 20:45 | Cuevas/Mannarino v Brkic T / Cacic N | 7-6,2-6,4-6 |
| ATP Winston-Salem MD | 2021/08/23 18:00 | Brkic T / Cacic N v Mahut/Martin | 4-6,1-6 |
| ATP - Miami - Doubles Hommes | 2021/03/25 15:00 | Fritz/Isner v Bublik/Mannarino | 7-5,6-3 |