Stadium: Court 1 Round: 28 Ground: Clay
| Challenger Oeiras MD | 2021/05/27 15:35 | King/Oliveira v Cachin/Ugo Carabelli | 6-4,1-6,7-10 |
| Challenger Oeiras MD | 2021/05/26 13:30 | Cachin/Ugo Carabelli v Bortolotti/Galovic | 6-3,6-2 |
| Challenger Oeiras MD | 2021/05/26 14:50 | Brown/Weissborn v De Jong/Van Rijthoven | 6-4,1-6,10-12 |
| Challenger Oeiras MD | 2021/05/25 15:30 | De Jong/Van Rijthoven v Tseng/Wu | 6-2,6-1 |