Stadium: Court 1 Round: 28 Ground: Hardcourt indoor
| ATP Marbella MD | 2021/04/11 10:00 | Behar/Escobar v Brkic/Cacic | 6-2,6-4 |
| ATP Buenos Aires MD | 2021/03/07 16:00 | Behar/Escobar v Brkic/Cacic | 3-6,5-7 |
| ATP Belgrade MD | 2021/04/22 13:40 | Behar/Escobar v Millman/Smith | 6-4,7-5 |
| ATP Belgrade MD | 2021/04/20 13:20 | Sitak/Travaglia v Behar/Escobar | 2-6,6-3,6-10 |
| ATP Monte Carlo MD | 2021/04/15 11:20 | Behar/Escobar v Mektic/Pavic | 4-6,6-1,3-10 |
| ATP Monte Carlo MD | 2021/04/14 14:25 | Behar/Escobar v Dimitrov/Goffin | 6-4,6-3 |
| ATP Marbella MD | 2021/04/11 10:00 | Behar/Escobar v Brkic/Cacic | 6-2,6-4 |
| ATP Marbella MD | 2021/04/10 12:30 | Nys/Puetz v Behar/Escobar | 4-6,6-7 |
| ATP Marbella MD | 2021/04/08 10:00 | Behar/Escobar v Goransson/Monroe | 6-4,7-5 |
| ATP Marbella MD | 2021/04/06 15:15 | Saville/Smith v Behar/Escobar | 1-6,7-5,10-12 |
| ATP Belgrade MD | 2021/04/22 10:00 | Brkic/Cacic v Bolelli/Gonzalez | 0-6,7-6,10-8 |
| ATP Belgrade MD | 2021/04/21 11:00 | Arevalo/Middelkoop v Brkic/Cacic | 4-6,6-7 |
| 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 |