# 2024 Open de Oeiras – Singles

Facundo Díaz Acosta was the defending champion but chose not to defend his title.
Francisco Comesaña won the title after defeating Ugo Blanchet 6–4, 3–6, 7–5 in the final.

## Seeds

* Fabio Fognini (second round)
* Thiago Monteiro (first round)
* Zsombor Piros (withdrew)
* Francisco Comesaña (champion)
* Emilio Nava (second round)
* Térence Atmane (second round)
* Nicolas Moreno de Alboran (first round)
* Juan Manuel Cerúndolo (first round)
* Jesper de Jong (second round)

## 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 | Final |
| | Ugo Blanchet | 6 | 6 | | | | | | |
| Q | Valentin Royer | 4 | 2 | | | | | | |
| Q | Valentin Royer | 4 | 2 | | | Ugo Blanchet | 4 | 6 | 5 |
| | | | | | 4 | Francisco Comesaña | 6 | 3 | 7 |
| 4 | Francisco Comesaña | 5 | 7$^7$ | 6 | 4 | Francisco Comesaña | 6 | 3 | 7 |
| WC | Jaime Faria | 7 | 6$^4$ | 0 | | | | | |

### 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 | F Fognini | 4 | 6 | 6 | | | | | | | | | | | | | | |
| | J De Loore | 6 | 4 | 4 | 1 | F Fognini | 5 | 6 | 6$^5$ | | | | | | | | | |
| SE | J Kovalík | 6$^1$ | 2 | | SE | S Napolitano | 7 | 4 | 7$^7$ | | | | | | | | | |
| SE | S Napolitano | 7$^7$ | 6 | | | | | | | SE | S Napolitano | 6 | 1 | 4 | | | | |
| | U Blanchet | 6 | 7$^7$ | | | | | | | | U Blanchet | 4 | 6 | 6 | | | | |
| | H Rocha | 3 | 6$^1$ | | | U Blanchet | 6 | 7$^7$ | | | | | | | | | | |
| Q | Mathys Erhard | 6 | 3 | 2 | 5 | E Nava | 4 | 6$^3$ | | | | | | | | | | |
| 5 | E Nava | 4 | 6 | 6 | | | | | | | | | | | | U Blanchet | 6 | 6 |
| 9 | J de Jong | 6 | 6 | | | | | | | | | | | | Q | V Royer | 4 | 2 |
| Q | G Onclin | 3 | 2 | | 9 | J de Jong | 2 | 3 | | | | | | | | | | |
| Q | V Royer | 6 | 5 | 6 | Q | V Royer | 6 | 6 | | | | | | | | | | |
| Q | A Andreev | 0 | 7 | 4 | | | | | | Q | V Royer | 7$^9$ | 1 | 6 | | | | |
| | F Agamenone | 6 | 3 | 6 | | | | | | | D Novak | 6$^7$ | 6 | 3 | | | | |
| | G Blancaneaux | 3 | 6 | 3 | | F Agamenone | 3 | 1 | | | | | | | | | | |
| | D Novak | 6 | 6 | | | D Novak | 6 | 6 | | | | | | | | | | |
| 8 | JM Cerúndolo | 3 | 2 | | | | | | | | | | | | | | | |

### 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 | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 7 | N Moreno de Alboran | 5 | 5 | | | | | | | | | | | | | | | |
| Q | Samuel Vincent Ruggeri | 7 | 7 | | Q | S Vincent Ruggeri | 6 | 6 | | | | | | | | | | |
| WC | G Elias | 6 | 1 | | WC | G Elias | 2 | 3 | | | | | | | | | | |
| LL | M Kaśnikowski | 1 | 1$^r$ | | | | | | | Q | S Vincent Ruggeri | 3 | 4 | | | | | |
| | V Sachko | 4 | 0$^r$ | | | | | | | 4 | F Comesaña | 6 | 6 | | | | | |
| | E Ymer | 6 | 0 | | | E Ymer | 6 | 4 | 6$^6$ | | | | | | | | | |
| | S Rodríguez Taverna | 2 | 7 | 3 | 4 | F Comesaña | 1 | 6 | 7$^8$ | | | | | | | | | |
| 4 | F Comesaña | 6 | 5 | 6 | | | | | | | | | | 4 | F Comesaña | 5 | 7$^7$ | 6 |
| 6 | T Atmane | 2 | 6 | 6 | | | | | | | | | | WC | J Faria | 7 | 6$^4$ | 0 |
| | B Harris | 6 | 3 | 4 | 6 | T Atmane | 1 | 0 | | | | | | | | | | |
| | V Gaubas | 7 | 2 | 6 | | V Gaubas | 6 | 6 | | | | | | | | | | |
| WC | F Ferreira Silva | 5 | 6 | 3 | | | | | | | V Gaubas | 4 | 6$^5$ | | | | | |
| | Q Halys | 6 | 6$^3$ | 2 | | | | | | WC | J Faria | 6 | 7$^7$ | | | | | |
| Q | C-h Tseng | 4 | 7$^7$ | 6 | Q | C-h Tseng | 2 | 3 | | | | | | | | | | |
| WC | J Faria | 6 | 3 | 7$^7$ | WC | J Faria | 6 | 6 | | | | | | | | | | |
| 2 | T Monteiro | 2 | 6 | 6$^2$ | | | | | | | | | | | | | | |