| Singles | |
|---|---|
| 2021 Open de Oeiras IV | |
| Champion |  Gastão Elias |
| Runner-up |  Holger Rune |
| Score | 5–7, 6–4, 6–4 |
Carlos Alcaraz was the defending champion [1] but chose not to defend his title.
Gastão Elias won the title after defeating Holger Rune 5–7, 6–4, 6–4 in the final.
Mathias Bourgue (first round)
Wu Tung-lin (second round)
Julian Lenz (second round) Tseng Chun-hsin (second round)
Roberto Quiroz (first round)
Carlos Gimeno Valero (quarterfinals)
Pedro Cachin (first round)
Riccardo Bonadio (second round)| Semifinals | Final | ||||||||||||
| Gastão Elias | 4 | 7 | 0 | ||||||||||
| Nuno Borges | 6 | 5 | 0r | ||||||||||
| Gastão Elias | 5 | 6 | 6 | ||||||||||
| Holger Rune | 7 | 4 | 4 | ||||||||||
| Holger Rune | 6 | 3 | 6 | ||||||||||
| Q |  Timofey Skatov | 2 | 6 | 2 | |||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | M Bourgue | 2 | 2 | ||||||||||||||||||||||||
| WC | Pedro Araújo | 6 | 6 | WC | P Araújo | 5 | 0 | ||||||||||||||||||||
| G Elias | 6 | 6 | G Elias | 7 | 6 | ||||||||||||||||||||||
| WC | Luís Faria | 2 | 3 | G Elias | 60 | 6 | 6 | ||||||||||||||||||||
| C Ugo Carabelli | 6 | 6 | C Ugo Carabelli | 77 | 3 | 0 | |||||||||||||||||||||
 J de Jong | 4 | 2 | C Ugo Carabelli | 4 | 7 | 6 | |||||||||||||||||||||
 J Forejtek | 64 | 6 | 0 | 8 | R Bonadio | 6 | 5 | 4 | |||||||||||||||||||
| 8 | R Bonadio | 77 | 3 | 6 | G Elias | 4 | 7 | 0 | |||||||||||||||||||
| 4 | C-h Tseng | 6 | 6 | N Borges | 6 | 5 | 0r | ||||||||||||||||||||
| R Ortega Olmedo | 4 | 2 | 4 | C-h Tseng | 3 | 6 | 1 | ||||||||||||||||||||
| J Härteis | 3 | 0 | Q |  FC Jianu | 6 | 3 | 6 | ||||||||||||||||||||
| Q | FC Jianu | 6 | 6 | Q | FC Jianu | 4 | 4 | ||||||||||||||||||||
 N Serdarušić | 4 | 5 | N Borges | 6 | 6 | ||||||||||||||||||||||
| Q | D Yevseyev | 6 | 7 | Q | D Yevseyev | 77 | 4 | 2 | |||||||||||||||||||
| N Borges | 6 | 6 | N Borges | 62 | 6 | 6 | |||||||||||||||||||||
| 5 | R Quiroz | 3 | 0 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | C Gimeno Valero | 6 | 6 | ||||||||||||||||||||||||
 V Sachko | 2 | 1 | 6 | C Gimeno Valero | 6 | 6 | |||||||||||||||||||||
| PR | V Galović | 4 | 77 | 6 | PR | V Galović | 4 | 2 | |||||||||||||||||||
| D Ajduković | 6 | 64 | 1 | 6 | C Gimeno Valero | 2 | 4 | ||||||||||||||||||||
| H Rune | 6 | 6 | H Rune | 6 | 6 | ||||||||||||||||||||||
| T van Rijthoven | 3 | 4 | H Rune | 5 | 6 | 6 | |||||||||||||||||||||
| Alt | C Denolly | 4 | 0 | 3 | J Lenz | 7 | 4 | 3 | |||||||||||||||||||
| 3 | J Lenz | 6 | 6 | H Rune | 6 | 3 | 6 | ||||||||||||||||||||
| 7 | P Cachin | 4 | 7 | 61 | Q | T Skatov | 2 | 6 | 2 | ||||||||||||||||||
| G Oliveira | 6 | 5 | 77 | G Oliveira | 3 | 1 | |||||||||||||||||||||
| I Sijsling | 6 | 2 | 64 | Q | T Skatov | 6 | 6 | ||||||||||||||||||||
| Q | T Skatov | 2 | 6 | 77 | Q | T Skatov | 77 | 5 | 6 | ||||||||||||||||||
| G Blancaneaux | 3 | 2 | Q | N Sánchez Izquierdo | 64 | 7 | 1 | ||||||||||||||||||||
| Q | N Sánchez Izquierdo | 6 | 6 | Q | N Sánchez Izquierdo | 6 | 77 | ||||||||||||||||||||
| WC | T Cação | 1 | 1 | 2 | T-l Wu | 2 | 62 | ||||||||||||||||||||
| 2 | T-l Wu | 6 | 6 | ||||||||||||||||||||||||
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