Stadium: Court 1 Round: 26 Ground: Hardcourt indoor
| ATP Marbella MD | 2021/04/09 12:00 | Arevalo/Middelkoop v Brkic/Cacic | 4-6,4-6 |
| ATP Marbella MD | 2021/04/09 12:00 | Arevalo/Middelkoop v Brkic/Cacic | 4-6,4-6 |
| ATP Marbella MD | 2021/04/08 11:40 | Gonzalez/Reyes-Valera v Arevalo/Middelkoop | 3-6,2-6 |
| ATP Marbella MD | 2021/04/07 13:30 | Erlich/Vasilevski v Arevalo/Middelkoop | 4-6,6-7 |
| ATP Dubai MD | 2021/03/15 13:00 | Arevalo/Middelkoop v Dodig/Polasek | 6-3,5-7,13-15 |
| ATP Dubai MD | 2021/03/14 11:00 | Arevalo/Middelkoop v Sonego/Vavassori | 6-7,5-7 |
| ATP Dubai MD | 2021/03/13 14:05 | Arevalo/Middelkoop v Gabashvili/Popko | 6-7,6-1,10-8 |
| ATP Doha MD | 2021/03/09 16:15 | Arevalo/Middelkoop v Mektic/Pavic | 1-6,3-6 |
| ATP Montpellier MD | 2021/02/25 13:15 | Lammons/Withrow v Arevalo/Middelkoop | 6-4,7-6 |
| Challenger Belgrade MD | 2021/04/17 12:10 | Duran/Molteni v Brkic/Cacic | 6-4,6-4 |
| Challenger Belgrade MD | 2021/04/16 17:15 | Brkic/Cacic v Bagnis/Cerundolo | 6-0,7-6 |
| Challenger Belgrade MD | 2021/04/15 17:00 | Jebavy/Zelenay v Brkic/Cacic | 6-7,3-6 |
| Challenger Belgrade MD | 2021/04/15 09:00 | Troicki/Zekic v Brkic/Cacic | 4-6,2-6 |
| ATP Marbella MD | 2021/04/11 10:00 | Behar/Escobar v Brkic/Cacic | 6-2,6-4 |
| ATP Marbella MD | 2021/04/09 12:00 | Arevalo/Middelkoop v Brkic/Cacic | 4-6,4-6 |
| ATP Marbella MD | 2021/04/07 15:15 | Brkic/Cacic v Daniell/Oswald | 4-6,7-6,11-9 |
| ATP Marbella MD | 2021/04/06 13:55 | Brkic/Cacic v Arends/Pel | 1-6,6-0,10-5 |