# 2023 San Marino Open – Singles

Pavel Kotov was the defending champion but chose not to defend his title.
Jaume Munar won the title after defeating Andrea Pellegrino 6–4, 6–1 in the final.

## Seeds

* Alexandre Müller (first round)
* Jaume Munar (champion)
* David Goffin (quarterfinals)
* Fabio Fognini (quarterfinals)
* Flavio Cobolli (first round)
* Kimmer Coppejans (second round)
* Zdeněk Kolář (first round)
* Marc Polmans (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 |
| | Andrea Pellegrino | 3 | 6 | 0 | | | | |
| | Nerman Fatić | 6 | 3 | 0$^r$ | | | | |
| | Nerman Fatić | 6 | 3 | 0$^r$ | | Andrea Pellegrino | 4 | 1 |
| | | | | | 2 | Jaume Munar | 6 | 6 |
| | Daniel Rincón | 6 | 1 | 2 | 2 | Jaume Munar | 6 | 6 |
| 2 | Jaume Munar | 0 | 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| 1 | A Müller | 3 | 4 | | | | | | | | | | | | | | |
| Q | E Dalla Valle | 6 | 6 | | Q | E Dalla Valle | 4 | 6 | 1 | | | | | | | | |
| | A Dougaz | 3 | 1$^r$ | | | A Pellegrino | 6 | 1 | 6 | | | | | | | | |
| | A Pellegrino | 6 | 4 | | | | | | | | A Pellegrino | 7$^7$ | 7$^7$ | | | | |
| Q | Alexander Weis | 7 | 1 | | | | | | | Q | A Weis | 6$^3$ | 6$^3$ | | | | |
| | G Mager | 5 | 1$^r$ | | Q | A Weis | 6 | 3 | 7$^7$ | | | | | | | | |
| Q | V Vacherot | 6 | 6 | | Q | V Vacherot | 4 | 6 | 6$^3$ | | | | | | | | |
| 7 | Z Kolář | 2 | 3 | | | | | | | | | | | A Pellegrino | 3 | 6 | 0 |
| 3 | D Goffin | 6 | 7 | | | | | | | | | | | N Fatić | 6 | 3 | 0$^r$ |
| | F Gaio | 2 | 5 | | 3 | D Goffin | 6$^0$ | 6 | 6 | | | | | | | | |
| | V Sachko | 6 | 2 | 6 | | V Sachko | 7$^7$ | 2 | 2 | | | | | | | | |
| | ND Ionel | 4 | 6 | 3 | | | | | | 3 | D Goffin | 2 | 3 | | | | |
| | RA Burruchaga | 3 | 6 | 3 | | | | | | | N Fatić | 6 | 6 | | | | |
| | N Fatić | 6 | 3 | 6 | | N Fatić | 7 | 6 | | | | | | | | | |
| Q | K Jacquet | 6 | 4 | 6 | Q | K Jacquet | 5 | 4 | | | | | | | | | |
| 5/WC | F Cobolli | 3 | 6 | 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 | Semifinals |
| 6 | K Coppejans | 6 | 6 | | | | | | | | | | | | | | | | |
| | DN Mădăraș | 4 | 4 | | 6 | K Coppejans | 3 | 2 | | | | | | | | | | | |
| | D Rincón | 7$^7$ | 7$^7$ | | | D Rincón | 6 | 6 | | | | | | | | | | | |
| Q | Marcello Serafini | 6$^5$ | 6$^4$ | | | | | | | | D Rincón | 6$^4$ | 6 | 6 | | | | | |
| WC | M De Rossi | 3 | 4 | | | | | | | 4/WC | F Fognini | 7$^7$ | 4 | 4 | | | | | |
| | Edoardo Lavagno | 6 | 6 | | | E Lavagno | 3 | 5 | | | | | | | | | | | |
| | A Collarini | 0 | 1 | | 4/WC | F Fognini | 6 | 7 | | | | | | | | | | | |
| 4/WC | F Fognini | 6 | 6 | | | | | | | | | | | | | D Rincón | 6 | 1 | 2 |
| 8 | M Polmans | 1 | 3 | | | | | | | | | | | | 2 | J Munar | 0 | 6 | 6 |
| | F Delbonis | 6 | 6 | | | F Delbonis | 6 | 5 | 6 | | | | | | | | | | |
| | A Giannessi | 1 | 6 | 6 | | A Giannessi | 3 | 7 | 1 | | | | | | | | | | |
| | M Echargui | 6 | 4 | 4 | | | | | | | F Delbonis | 4 | 5 | | | | | | |
| Q | C Taberner | 6 | 2 | 5 | | | | | | 2 | J Munar | 6 | 7 | | | | | | |
| | N Sánchez Izquierdo | 2 | 6 | 7 | | N Sánchez Izquierdo | 1 | 2 | | | | | | | | | | | |
| | F Passaro | 4 | 4 | | 2 | J Munar | 6 | 6 | | | | | | | | | | | |
| 2 | J Munar | 6 | 6 | | | | | | | | | | | | | | | | |