Stadium: Court 6 Round: 24 Ground: Hardcourt outdoor
| ATP Winston-Salem MD | 2021/08/23 18:00 | Brkic T / Cacic N v Mahut/Martin | 4-6,1-6 |
| ATP Kitzbuhel MD | 2021/07/30 08:30 | Brkic T / Cacic N v Erler/Miedler | 6-1,1-6,10-12 |
| ATP Kitzbuhel MD | 2021/07/28 13:05 | Brkic T / Cacic N v Matos/Vasilevski | 7-6,2-6,10-8 |
| ATP Kitzbuhel MD | 2021/07/27 13:15 | Brkic T / Cacic N v Pel/Rinderknech | 6-2,6-3 |
| ATP Umag MD | 2021/07/24 21:50 | Brkic T / Cacic N v Romboli F / Vega Hernandez D | 3-6,5-7 |
| ATP Umag MD | 2021/07/23 18:50 | Brkic T / Cacic N v Sabanov/Sabanov | 6-1,6-2 |
| ATP Umag MD | 2021/07/22 18:45 | Brkic T / Cacic N v R Jebavy / J Vesely | 6-2,6-2 |
| ATP Umag MD | 2021/07/21 19:40 | Brkic T / Cacic N v Ajdukovic/Nincevic | 6-4,3-6,10-8 |