Oeiras 4 challenger · ATP
Oeiras 4 challenger 2021
ChallengerClayOeiras, Portugal23 May – 30 May 2021Prize money: 31,440 EUR43 matchesAltitude: 30 mCourt: Slow
Champion Gastao Elias · Final: 6-4 6-4
Final rounds
| Final | Gastao Elias vs Holger Rune | 5-7 6-4 6-4 |
| Semifinal | Holger Rune vs Timofey Skatov | 6-2 3-6 6-2 |
| Semifinal | Gastao Elias vs Nuno Borges | 4-6 7-5 ret. |
| Quarterfinal | Holger Rune vs Carlos Gimeno Valero | 6-2 6-4 |
| Quarterfinal | Gastao Elias vs Camilo Ugo Carabelli | 6-7(0) 6-3 6-0 |
| Quarterfinal | Timofey Skatov vs Nikolas Sanchez Izquierdo | 7-6(4) 5-7 6-1 |
| Quarterfinal | Nuno Borges vs Filip Cristian Jianu | 6-4 6-4 |
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