# 2024 Oeiras Indoors II – Singles

Maks Kaśnikowski was the defending champion but lost in the second round to Valentin Royer.
Leandro Riedi won the title after defeating Martin Damm 7–6$^{(8–6)}$, 6–2 in the final.

## Seeds

* Alejandro Moro Cañas (quarterfinals)
* Henrique Rocha (first round)
* João Sousa (quarterfinals)
* Oscar Otte (withdrew)
* Cem İlkel (first round)
* Martin Damm (final)
* Maxime Janvier (first round)
* Leandro Riedi (champion)

## 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 | Marius Copil | 3 | 7$^7$ | 5 | | | | |
| 6 | Martin Damm | 6 | 6$^5$ | 7 | | | | |
| 6 | Martin Damm | 6 | 6$^5$ | 7 | 6 | Martin Damm | 6$^6$ | 2 |
| | | | | | 8 | Leandro Riedi | 7$^8$ | 6 |
| 8 | Leandro Riedi | 6 | 6 | | 8 | Leandro Riedi | 7$^8$ | 6 |
| SE | Gastão Elias | 3 | 3 | | | | | |

### 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 | A Moro Cañas | 2 | 7$^7$ | 6 | | | | | | | | | | | | | | | |
| | A Mayo | 6 | 6$^2$ | 4 | 1 | A Moro Cañas | 6 | 7 | | | | | | | | | | | |
| | A Holmgren | 6 | 0 | | | A Holmgren | 3 | 5 | | | | | | | | | | | |
| | M Neuchrist | 2 | 0$^r$ | | | | | | | 1 | A Moro Cañas | 4 | 7$^8$ | 6$^7$ | | | | | |
| Q | M Copil | 6 | 6$^5$ | 7$^8$ | | | | | | Q | M Copil | 6 | 6$^6$ | 7$^9$ | | | | | |
| | A Andreev | 2 | 7$^7$ | 6$^6$ | Q | M Copil | 7$^7$ | 3 | 6 | | | | | | | | | | |
| | M Martineau | 6 | 4 | 6 | | M Martineau | 6$^5$ | 6 | 1 | | | | | | | | | | |
| 7 | M Janvier | 4 | 6 | 2 | | | | | | | | | | | Q | M Copil | 3 | 7$^7$ | 5 |
| 3 | J Sousa | 7$^7$ | 3 | 7$^7$ | | | | | | | | | | | 6 | M Damm | 6 | 6$^5$ | 7 |
| Q | Samuel Vincent Ruggeri | 6$^5$ | 6 | 6$^5$ | 3 | J Sousa | 6 | 6 | | | | | | | | | | | |
| | L Giustino | 6 | 2 | 7 | | L Giustino | 3 | 1 | | | | | | | | | | | |
| Q | M Vrbenský | 4 | 6 | 5 | | | | | | 3 | J Sousa | 2 | 5 | | | | | | |
| WC | Tiago Pereira | 4 | 1 | | | | | | | 6 | M Damm | 6 | 7 | | | | | | |
| PR | P Jubb | 6 | 6 | | PR | P Jubb | 2 | 6 | 5 | | | | | | | | | | |
| | M Geerts | 6$^1$ | 4 | | 6 | M Damm | 6 | 3 | 7 | | | | | | | | | | |
| 6 | M Damm | 7$^7$ | 6 | | | | | | | | | | | | | | | | |

### 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 |
| 8 | L Riedi | 6 | 6 | | | | | | | | | | | | | | |
| Q | A McHugh | 2 | 3 | | 8 | L Riedi | 6 | 6 | | | | | | | | | |
| Q | S Fanselow | 6 | 0 | | Q | S Fanselow | 3 | 0 | | | | | | | | | |
| WC | J Faria | 2 | 0$^r$ | | | | | | | 8 | L Riedi | 6 | 6 | | | | |
| | E Dalla Valle | 4 | 6 | 7$^7$ | | | | | | Q | E Møller | 3 | 2 | | | | |
| LL | D Added | 6 | 3 | 6$^5$ | | E Dalla Valle | 2 | 1 | | | | | | | | | |
| PR | N Álvarez Varona | 5 | 0$^r$ | | Q | E Møller | 6 | 6 | | | | | | | | | |
| Q | E Møller | 7 | 1 | | | | | | | | | | | 8 | L Riedi | 6 | 6 |
| 5 | C İlkel | 2 | 3 | | | | | | | | | | | SE | G Elias | 3 | 3 |
| SE | G Elias | 6 | 6 | | SE | G Elias | 3 | 7 | 6 | | | | | | | | |
| | E Quinn | 7 | 6 | | | E Quinn | 6 | 5 | 4 | | | | | | | | |
| WC | J Domingues | 5 | 3 | | | | | | | SE | G Elias | 6 | 6 | | | | |
| | M Bourgue | 1 | 6 | 3 | | | | | | | V Royer | 4 | 4 | | | | |
| SE | M Kaśnikowski | 6 | 1 | 6 | SE | M Kaśnikowski | 3 | 2 | | | | | | | | | |
| | V Royer | 6 | 6 | | | V Royer | 6 | 6 | | | | | | | | | |
| 2 | H Rocha | 3 | 0 | | | | | | | | | | | | | | |