# 2024 Oeiras Indoors – Singles

Arthur Fils was the defending champion but chose not to defend his title.
Maks Kaśnikowski won the title after defeating Gastão Elias 7–6$^{(7–1)}$, 4–6, 6–3 in the final.

## Seeds

* Henrique Rocha (first round)
* João Sousa (quarterfinals)
* Cem İlkel (second round)
* Maxime Janvier (first round, retired)
* Adrian Andreev (first round)
* Valentin Royer (semifinals)
* Mathias Bourgue (second round)
* Michael Geerts (first 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 |
| Q | Egor Gerasimov | 4 | 6 | 3 | | | | |
| | Gastão Elias | 6 | 3 | 6 | | | | |
| | Gastão Elias | 6 | 3 | 6 | Gastão Elias | 6$^1$ | 6 | 3 |
| | | | | | Maks Kaśnikowski | 7$^7$ | 4 | 6 |
| 6 | Valentin Royer | 4 | 4 | | Maks Kaśnikowski | 7$^7$ | 4 | 6 |
| | Maks Kaśnikowski | 6 | 6 | | | | | |

### 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 | Semifinals |
| 1 | H Rocha | 4 | 4 | | | | | | | | | | | | | | | | |
| | T-S Kwiatkowski | 6 | 6 | | | T-S Kwiatkowski | 6 | 6 | | | | | | | | | | | |
| | L Giustino | 7 | 4 | 6 | | L Giustino | 4 | 4 | | | | | | | | | | | |
| | M Vrbenský | 5 | 6 | 4 | | | | | | | T-S Kwiatkowski | 7$^7$ | 3 | 4 | | | | | |
| WC | Tiago Pereira | 6$^5$ | 1 | | | | | | | Q | E Gerasimov | 6$^2$ | 6 | 6 | | | | | |
| Q | E Gerasimov | 7$^7$ | 6 | | Q | E Gerasimov | 6 | 2 | 6 | | | | | | | | | | |
| | T Kodat | 3 | 1 | | 7 | M Bourgue | 4 | 6 | 4 | | | | | | | | | | |
| 7 | M Bourgue | 6 | 6 | | | | | | | | | | | | Q | E Gerasimov | 4 | 6 | 3 |
| 3 | C İlkel | 6 | 3 | 7 | | | | | | | | | | | | G Elias | 6 | 3 | 6 |
| | S Fanselow | 3 | 6 | 5 | 3 | C İlkel | 4 | 2 | | | | | | | | | | | |
| Q | K de Schepper | 4 | 4 | | | G Elias | 6 | 6 | | | | | | | | | | | |
| | G Elias | 6 | 6 | | | | | | | | G Elias | 6 | 3 | 6 | | | | | |
| LL | Vadym Ursu | 6 | 7 | | | | | | | WC | J Faria | 2 | 6 | 4 | | | | | |
| | E Quinn | 4 | 5 | | LL | V Ursu | 3 | 4 | | | | | | | | | | | |
| WC | J Faria | 7$^8$ | 6 | | WC | J Faria | 6 | 6 | | | | | | | | | | | |
| 8 | M Geerts | 6$^6$ | 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 |
| 6 | V Royer | 6 | 6$^1$ | 6 | | | | | | | | | | | | | |
| | C Broom | 3 | 7$^7$ | 3 | 6 | V Royer | 6$^1$ | 6 | 6 | | | | | | | | |
| | G Debru | 4 | 1 | | Q | A Gray | 7$^7$ | 1 | 3 | | | | | | | | |
| Q | A Gray | 6 | 6 | | | | | | | 6 | V Royer | 6 | 6 | | | | |
| Q | J Clarke | 6 | 7$^7$ | | | | | | | | T Lamasine | 4 | 3 | | | | |
| | A Mayo | 3 | 6$^2$ | | Q | J Clarke | 6 | 4 | 4 | | | | | | | | |
| | T Lamasine | 7$^7$ | 0 | | | T Lamasine | 1 | 6 | 6 | | | | | | | | |
| 4 | M Janvier | 6$^3$ | 0$^r$ | | | | | | | | | | | 6 | V Royer | 4 | 4 |
| 5 | A Andreev | 6 | 6$^{10}$ | 3 | | | | | | | | | | | M Kaśnikowski | 6 | 6 |
| | M Kaśnikowski | 3 | 7$^{12}$ | 6 | | M Kaśnikowski | 7 | 6 | | | | | | | | | |
| Q | N Rubin | 4 | 6 | 5 | WC | J Domingues | 5 | 4 | | | | | | | | | |
| WC | J Domingues | 6 | 1 | 7 | | | | | | | M Kaśnikowski | 7$^7$ | 6 | | | | |
| PR | N Álvarez Varona | 5 | 2 | | | | | | | 2 | J Sousa | 6$^1$ | 4 | | | | |
| PR | P Jubb | 7 | 6 | | PR | P Jubb | 6$^6$ | 4 | | | | | | | | | |
| Q | Samuel Vincent Ruggeri | 4 | 2 | | 2 | J Sousa | 7$^8$ | 6 | | | | | | | | | |
| 2 | J Sousa | 6 | 6 | | | | | | | | | | | | | | |