Stadium: Court 1 Round: 27 Ground: Hardcourt indoor
| ATP Stockholm - Herredouble | 2021/11/08 13:00 | Bublik/Golubev v Brkic/Cacic | 3-6,1-6 |
| ATP St Petersburg - Herredouble | 2021/10/27 14:45 | Brkic/Cacic v Gonzalez/Molteni | 4-6,6-2,7-10 |
| ATP Moskva - Herredouble | 2021/10/24 11:40 | Brkic/Cacic v Heliovaara/Middelkoop | 5-7,6-4,9-11 |
| ATP Moskva - Herredouble | 2021/10/22 15:05 | Ivashka/Martinez v Brkic/Cacic | 4-6,6-4,8-10 |
| ATP Moskva - Herredouble | 2021/10/21 11:00 | Brkic/Cacic v Inglot/Skupski | 7-6,5-7,10-8 |
| ATP Moskva - Herredouble | 2021/10/18 11:00 | Brkic/Cacic v Bublik/Mannarino | 6-2,6-1 |
| ATP Sofia - Herredouble | 2021/10/01 09:00 | Gonzalez/Molteni v Brkic/Cacic | 6-7,6-2,10-4 |
| ATP Sofia - Herredouble | 2021/09/29 10:40 | Golubev/Nedovyesov v Brkic/Cacic | 3-6,7-6,7-10 |
| ATP Stockholm - Herredouble | 2021/11/08 14:05 | Fritz/Paul v Ruusuvuori/Van De Zandschulp | 6-4,4-6,8-10 |