# 2024 Lisboa Belém Open – Men's singles

Flavio Cobolli was the defending champion but chose not to defend his title.
Alexander Ritschard won the title after defeating Raphaël Collignon 6–3, 6–7$^{(3–7)}$, 6–3 in the final.

## Seeds

* Thiago Monteiro (withdrew)
* Daniel Altmaier (first round)
* Thiago Seyboth Wild (first round)
* Thiago Agustín Tirante (quarterfinals)
* Jozef Kovalík (second round)
* Laslo Djere (withdrew)
* Alexander Ritschard (champion)
* Daniel Elahi Galán (first round)
* Andrea Pellegrino (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 | Final |
| | Raphaël Collignon | 6$^2$ | 6 | 6 | | | | | |
| LL | Elmer Møller | 7$^7$ | 2 | 4 | | | | | |
| LL | Elmer Møller | 7$^7$ | 2 | 4 | | Raphaël Collignon | 3 | 7$^7$ | 3 |
| | | | | | 7 | Alexander Ritschard | 6 | 6$^3$ | 6 |
| | Emilio Nava | 6$^3$ | 0 | | 7 | Alexander Ritschard | 6 | 6$^3$ | 6 |
| 7 | Alexander Ritschard | 7$^7$ | 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 |
| LL | Sandro Kopp | 3 | 3 | | | | | | | | | | | | | | | | |
| | M Dodig | 6 | 6 | | | M Dodig | 6 | 2 | 1 | | | | | | | | | | |
| Q | D Rincón | 6$^2$ | 4 | | | Z Piros | 3 | 6 | 6 | | | | | | | | | | |
| | Z Piros | 7$^7$ | 6 | | | | | | | | Z Piros | 1 | 0 | | | | | | |
| | R Collignon | 7 | 6 | | | | | | | | R Collignon | 6 | 6 | | | | | | |
| WC | G Elias | 5 | 3 | | | R Collignon | 6 | 6 | | | | | | | | | | | |
| Q | M Kližan | 3 | 6$^6$ | | 5 | J Kovalík | 3 | 3 | | | | | | | | | | | |
| 5 | J Kovalík | 6 | 7$^8$ | | | | | | | | | | | | | R Collignon | 6$^2$ | 6 | 6 |
| 4 | TA Tirante | 6 | 7$^7$ | | | | | | | | | | | | LL | E Møller | 7$^7$ | 2 | 4 |
| Q | E Dalla Valle | 4 | 6$^4$ | | 4 | TA Tirante | 6 | 6 | | | | | | | | | | | |
| WC | F Ferreira Silva | 4 | 6 | 6 | WC | F Ferreira Silva | 3 | 1 | | | | | | | | | | | |
| | T Skatov | 6 | 2 | 2 | | | | | | 4 | TA Tirante | 4 | 6 | 3 | | | | | |
| | O Roca Batalla | 7 | 6 | | | | | | | LL | E Møller | 6 | 4 | 6 | | | | | |
| | J Faria | 5 | 2 | | | O Roca Batalla | 3 | 0$^r$ | | | | | | | | | | | |
| LL | E Møller | 6 | 6 | | LL | E Møller | 6 | 1 | | | | | | | | | | | |
| 9 | A Pellegrino | 3 | 1 | | | | | | | | | | | | | | | | |

### 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 |
| 8 | DE Galán | 6$^2$ | 6 | 6$^4$ | | | | | | | | | | | | | | |
| Q | G Fonio | 7$^7$ | 4 | 7$^7$ | Q | G Fonio | 3 | 3 | | | | | | | | | | |
| | E Nava | 6 | 6 | | | E Nava | 6 | 6 | | | | | | | | | | |
| | V Gaubas | 4 | 3 | | | | | | | | E Nava | 6 | 6 | | | | | |
| Alt | F Arnaboldi | 7$^7$ | 6 | | | | | | | | H Rocha | 1 | 2 | | | | | |
| WC | D Vale | 6$^5$ | 1 | | Alt | F Arnaboldi | 2 | 6 | 0 | | | | | | | | | |
| | H Rocha | 7$^7$ | 6 | | | H Rocha | 6 | 2 | 6 | | | | | | | | | |
| 3 | T Seyboth Wild | 6$^4$ | 3 | | | | | | | | | | | | | E Nava | 6$^3$ | 0 |
| 7 | A Ritschard | 7 | 4 | 6 | | | | | | | | | | | 7 | A Ritschard | 7$^7$ | 6 |
| | A Géa | 5 | 6 | 4 | 7 | A Ritschard | 6 | 6 | | | | | | | | | | |
| Q | D Novak | 6$^4$ | 6 | 3 | SE | L Pavlovic | 1 | 1 | | | | | | | | | | |
| SE | Luka Pavlovic | 7$^7$ | 3 | 6 | | | | | | 7 | A Ritschard | 6 | 4 | 6 | | | | |
| LL | A Andreev | 6 | 3 | 4 | | | | | | | T Barrios Vera | 3 | 6 | 2 | | | | |
| Q | C Tabur | 3 | 6 | 6 | Q | C Tabur | 3 | 2 | | | | | | | | | | |
| | T Barrios Vera | 4 | 6 | 7$^7$ | | T Barrios Vera | 6 | 6 | | | | | | | | | | |
| 2 | D Altmaier | 6 | 4 | 6$^5$ | | | | | | | | | | | | | | |