# 2023 Sardegna Open – Singles

Lorenzo Sonego was the defending champion but chose not to defend his title.
Ugo Humbert won the title after defeating Laslo Djere 4–6, 7–5, 6–4 in the final.

## Seeds

The top four seeds received a bye into the second round.
* Yoshihito Nishioka (second round)
* Ben Shelton (semifinals)
* Mackenzie McDonald (second round)
* Laslo Djere (final)
* Diego Schwartzman (first round)
* Ugo Humbert (champion)
* Marco Cecchinato (withdrew)
* Thiago Monteiro (first round, retired)

## 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 |
| | Daniel Elahi Galán | 2 | 6$^3$ | | | | | | |
| 6 | Ugo Humbert | 6 | 7$^7$ | | | | | | |
| 6 | Ugo Humbert | 6 | 7$^7$ | | 6 | Ugo Humbert | 4 | 7 | 6 |
| | | | | | 4 | Laslo Djere | 6 | 5 | 4 |
| 4 | Laslo Djere | 3 | 6 | 6 | 4 | Laslo Djere | 6 | 5 | 4 |
| 2 | Ben Shelton | 6 | 3 | 4 | | | | | |

### 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 | Y Nishioka | 6 | 1 | 4 | | | | | | | | | |
| WC | F Cobolli | 7 | 1 | 2 | | DE Galán | 2 | 6 | 6 | | | | | | | | | |
| | DE Galán | 5 | 6 | 6 | | | | | | | DE Galán | 6 | 4 | 6 | | | | |
| Q | S Travaglia | 3 | 7$^8$ | 4 | | | | | | | B Gojo | 3 | 6 | 3 | | | | |
| | B Gojo | 6 | 6$^6$ | 6 | | B Gojo | 6 | 7 | | | | | | | | | | |
| | Y Watanuki | 6 | 4 | | | Y Watanuki | 4 | 5 | | | | | | | | | | |
| 8 | T Monteiro | 4 | 2$^r$ | | | | | | | | | | | | | DE Galán | 2 | 6$^3$ |
| | | | | | | | | | | | | | | | 6 | U Humbert | 6 | 7$^7$ |
| | | | | | 3 | M McDonald | 2 | 3 | | | | | | | | | | |
| | A Kovacevic | 1 | 6 | 1 | | T Daniel | 6 | 6 | | | | | | | | | | |
| | T Daniel | 6 | 4 | 6 | | | | | | | T Daniel | 7$^{13}$ | 6$^7$ | 4 | | | | |
| WC | F Maestrelli | 6$^7$ | 4 | | | | | | | 6 | U Humbert | 6$^{11}$ | 7$^9$ | 6 | | | | |
| LL | A Pellegrino | 7$^9$ | 6 | | LL | A Pellegrino | 7$^7$ | 1 | 1$^r$ | | | | | | | | | |
| Q | G Mager | 4 | 3 | | 6 | U Humbert | 6$^2$ | 6 | 3 | | | | | | | | | |
| 6 | U Humbert | 6 | 6 | | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| Q | A Giannessi | 3 | 7$^9$ | 6 | | | | | | | | | | | | | | |
| | F Passaro | 6 | 6$^7$ | 4 | Q | A Giannessi | 4 | 2 | | | | | | | | | | |
| | T Kokkinakis | 6 | 6 | | | T Kokkinakis | 6 | 6 | | | | | | | | | | |
| | N Basilashvili | 4 | 3 | | | | | | | T Kokkinakis | 6 | 1 | 1 | | | | | |
| Q | S Diez | 6$^2$ | 4 | | | | | | 4 | L Djere | 3 | 6 | 6 | | | | | |
| Alt | J Kovalík | 7$^7$ | 6 | | Alt | J Kovalík | 4 | 2 | | | | | | | | | | |
| | | | | | 4 | L Djere | 6 | 6 | | | | | | | | | | |
| | | | | | | | | | | | | | | 4 | L Djere | 3 | 6 | 6 |
| 5 | D Schwartzman | 6 | 2 | 3 | | | | | | | | | | 2 | B Shelton | 6 | 3 | 4 |
| Alt | M Bellucci | 2 | 6 | 6 | Alt | M Bellucci | 2 | 0 | | | | | | | | | | |
| WC | A Vavassori | 6$^0$ | 6 | 4 | | G Zeppieri | 6 | 6 | | | | | | | | | | |
| | G Zeppieri | 7$^7$ | 4 | 6 | | | | | | G Zeppieri | 4 | 6 | 5 | | | | | |
| Alt | L Nardi | 3 | 6 | 4 | | | | | 2 | B Shelton | 6 | 4 | 7 | | | | | |
| Alt | F Marozsán | 6 | 4 | 6 | Alt | F Marozsán | 4 | 6$^6$ | | | | | | | | | | |
| | | | | | 2 | B Shelton | 6 | 7$^8$ | | | | | | | | | | |