Stadium: Court 1 Round: 26 Ground: Hardcourt indoor
| ATP Hamburg MD | 2021/07/14 10:30 | Golubev/Nedovyesov v Brkic/Cacic | 6-3,7-6 |
| ATP Nur-Sultan MD | 2021/09/23 14:20 | Arneodo/Bonzi v Golubev/Nedovyesov | 6-4,4-6,10-7 |
| ATP Nur-Sultan MD | 2021/09/21 14:40 | Duckworth/Ebden v Golubev/Nedovyesov | 6-7,2-6 |
| ATP Hamburg MD | 2021/07/16 15:00 | Golubev/Nedovyesov v Puetz/Venus | 3-6,4-6 |
| ATP Hamburg MD | 2021/07/15 10:30 | Behar/Escobar v Golubev/Nedovyesov | 4-6,4-6 |
| ATP Hamburg MD | 2021/07/14 10:30 | Golubev/Nedovyesov v Brkic/Cacic | 6-3,7-6 |
| Challenger Zagreb MD | 2021/05/15 10:25 | Golubev/Nedovyesov v King/Reese | 2-6,6-7 |
| Challenger Zagreb MD | 2021/05/14 13:00 | Golubev/Nedovyesov v Walkow/Zielinski | 7-6,6-4 |
| Challenger Zagreb MD | 2021/05/11 15:50 | Golubev/Nedovyesov v Baez/Wild | 6-1,2-6,10-0 |
| ATP Metz MD | 2021/09/24 13:35 | Nys/Rinderknech v Brkic/Cacic | 6-3,7-6 |
| ATP Metz MD | 2021/09/23 14:10 | Reese/Verbeek v Brkic/Cacic | 3-6,3-6 |
| ATP Metz MD | 2021/09/22 10:00 | Giron/Olivetti v Brkic/Cacic | 4-6,7-6,1-10 |
| 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 |