Stadium: Quadra 9 Round: 26 Ground: Hardcourt outdoor
| Challenger - Biella - mužská štvorhra | 2021/05/18 13:20 | Collarini/Etcheverry v Cerretani/Cornea | 2-6,6-7 |
| Challenger - Campinas - mužská štvorhra | 2021/11/21 00:20 | Matos/M R Alves v Klier Junior/P De Almeida | 6-3,6-1 |
| Challenger - Campinas - mužská štvorhra | 2021/11/20 17:30 | Casanova/Rodriguez Taverna v Klier Junior/P De Almeida | 3-6,4-6 |
| Challenger - Campinas - mužská štvorhra | 2021/11/18 17:40 | Cid Subervi/Sakamoto v Klier Junior/P De Almeida | 2-6,4-6 |
| Challenger - Campinas - mužská štvorhra | 2021/11/17 21:30 | Klier Junior/P De Almeida v Luz/Martinez | 6-3,3-6,10-4 |
| Challenger - Montevideo - mužská štvorhra | 2021/11/11 01:05 | Cerundolo/Cuevas v Klier Junior/P De Almeida | 6-3,6-2 |
| ITF - M25 Kiseljak - mužská štvorhra | 2021/05/29 13:30 | Reis da Silva/Sels v Klier Junior/P De Almeida | 4-6,6-4,10-4 |
| ITF - M25 Kiseljak - mužská štvorhra | 2021/05/28 17:00 | Basic/Fatic v Klier Junior/P De Almeida | 7-5,3-6,8-10 |
| ITF - M25 Kiseljak - mužská štvorhra | 2021/05/27 13:40 | Onclin/Riedi v Klier Junior/P De Almeida | 2-6,7-6,13-15 |