Stadium: Cancha Central Round: 26 Ground: Clay
| Challenger Buenos Aires MD | 2021/10/20 21:10 | Matos/M R Alves v Cerundolo/Cuevas | 6-2,7-5 |
| ITF M25 Kiseljak MD | 2021/05/29 13:30 | Reis da Silva/Sels v Klier Junior/P De Almeida | 4-6,6-4,10-4 |
| ITF M25 Kiseljak MD | 2021/05/28 17:00 | Basic/Fatic v Klier Junior/P De Almeida | 7-5,3-6,8-10 |
| ITF M25 Kiseljak MD | 2021/05/27 13:40 | Onclin/Riedi v Klier Junior/P De Almeida | 2-6,7-6,13-15 |
| ITF M25 Kiseljak MD | 2021/05/25 15:35 | Makk/Palovic v Klier Junior/P De Almeida | 0-6,1-6 |