title: 2021 Open de Oeiras III – Singles
text: # 2021 Open de Oeiras III – Singles
  
  Pedro Cachin was the defending champion but chose not to defend his title.
  
  Carlos Alcaraz won the title after defeating Facundo Bagnis 6–4, 6–4 in the final.
  
  ## Seeds
  
  * Jiří Veselý (second round, retired)
  * Steve Johnson (first round)
  * Federico Coria (second round)
  * Pedro Martínez (second round)
  * Yannick Hanfmann (first round)
  * Juan Ignacio Londero (first round)
  * Facundo Bagnis (final)
  * Pedro Sousa (quarterfinals)
  
  ## Draw
  
  ### Key
  
  * Q = Qualifier
  * WC = Wild card
  * LL = Lucky loser
  * Alt = Alternate
  * SE = Special exempt
  * PR = Protected ranking
  * ITF = ITF entry
  * JE = Junior exempt
  * w/o = Walkover
  * r = Retired
  * d = Defaulted
  * SR = Special ranking
  
  ### Finals
  
  | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
  | - | - | - | - | - | - | - | - | - |
  | | Taro Daniel | 2 | 7 | 2 | | | | |
  | | Carlos Alcaraz | 6 | 5 | 6 | | | | |
  | | Carlos Alcaraz | 6 | 5 | 6 | | Carlos Alcaraz | 6 | 6 |
  | | | | | | 7 | Facundo Bagnis | 4 | 4 |
  | 7 | Facundo Bagnis | 6 | 6 | | 7 | Facundo Bagnis | 4 | 4 |
  | | Hugo Gaston | 0 | 2 | | | | | |
  
  ### Top half
  
  | First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
  | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
  | 1 | J Veselý | 6 | $7^7$ | | | | | | | | | | | | | | | |
  | Q | H Grenier | 4 | $6^2$ | | 1 | J Veselý | 3 | $3^r$ | | | | | | | | | | |
  | | S Ofner | 1 | $6^4$ | | | H Dellien | 6 | 4 | | | | | | | | | | |
  | | H Dellien | 6 | $7^7$ | | | | | | | | H Dellien | 1 | 6 | 1 | | | | |
  | | B Rola | 1 | 5 | | | | | | | | T Daniel | 6 | 3 | 6 | | | | |
  | | T Daniel | 6 | 7 | | | T Daniel | 6 | 6 | | | | | | | | | | |
  | | L Mayer | 4 | 6 | 6 | | L Mayer | 3 | 4 | | | | | | | | | | |
  | 6 | JI Londero | 6 | 1 | 4 | | | | | | | | | | | T Daniel | 2 | 7 | 2 |
  | 3 | F Coria | 2 | 6 | 6 | | | | | | | | | | | C Alcaraz | 6 | 5 | 6 |
  | Q | A Molčan | 6 | 4 | 1 | 3 | F Coria | 4 | 6 | 4 | | | | | | | | | |
  | | M Cressy | $6^3$ | 4 | | WC | G Elias | 6 | 4 | 6 | | | | | | | | | |
  | WC | G Elias | $7^7$ | 6 | | | | | | | WC | G Elias | 5 | 4 | | | | | |
  | | C Alcaraz | 6 | 6 | | | | | | | | C Alcaraz | 7 | 6 | | | | | |
  | | Y Uchiyama | 0 | 3 | | | C Alcaraz | 3 | 6 | 6 | | | | | | | | | |
  | | B Nakashima | 6 | 6 | | | B Nakashima | 6 | 4 | 4 | | | | | | | | | |
  | 5 | Y Hanfmann | 3 | 4 | | | | | | | | | | | | | | | |
  
  ### Bottom half
  
  | First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
  | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - | - |
  | 7 | F Bagnis | 7 | 3 | | | | | | | | | | | | | | | |
  | | C Taberner | 5 | $2^r$ | | 7 | F Bagnis | 2 | 6 | 6 | | | | | | | | | |
  | | J Jung | 6 | 4 | 3 | Alt | F Ferreira Silva | 6 | 4 | 2 | | | | | | | | | |
  | Alt | F Ferreira Silva | 1 | 6 | 6 | | | | | | 7 | F Bagnis | 6 | 5 | 7 | | | | |
  | WC | N Borges | 6 | 6 | | | | | | | WC | N Borges | 1 | 7 | 5 | | | | |
  | | B Zapata Miralles | 4 | 4 | | WC | N Borges | 6 | 6 | | | | | | | | | | |
  | WC | J Domingues | 4 | 2 | | 4 | P Martínez | 2 | 4 | | | | | | | | | | |
  | 4 | P Martínez | 6 | 6 | | | | | | | | | | | | 7 | F Bagnis | 6 | 6 |
  | 8 | P Sousa | 3 | $7^7$ | 4 | | | | | | | | | | | | H Gaston | 0 | 2 |
  | | D Džumhur | 6 | $6^4$ | $0^r$ | 8 | P Sousa | 6 | 6 | | | | | | | | | | |
  | | D Kudla | 4 | 6 | 5 | | B van de Zandschulp | 3 | 2 | | | | | | | | | | |
  | | B van de Zandschulp | 6 | 3 | 7 | | | | | | 8 | P Sousa | 3 | 6 | 2 | | | | |
  | | H Gaston | $7^7$ | 6 | | | | | | | | H Gaston | 6 | 1 | 6 | | | | |
  | Q | Z Bergs | $6^1$ | 1 | | | H Gaston | 6 | 6 | | | | | | | | | | |
  | Q | E Gómez | $7^7$ | 3 | 6 | Q | E Gómez | 4 | 3 | | | | | | | | | | |
  | 2 | S Johnson | $6^4$ | 6 | 3 | | | | | | | | | | | | | | |
  