| Singles | |
|---|---|
| 2023 Sanremo Challenger | |
| Champion |  Luca Van Assche |
| Runner-up |  Juan Pablo Varillas |
| Score | 6–1, 6–3 |
Holger Rune was the defending champion [1] but chose not to defend his title.
Luca Van Assche won the title after defeating Juan Pablo Varillas 6–1, 6–3 in the final.
Juan Pablo Varillas (final)
Marco Cecchinato (first round)
Alexander Shevchenko (second round) Aslan Karatsev (first round) Luca Van Assche (champion) Matteo Arnaldi (first round) Pavel Kotov (first round, retired) Giulio Zeppieri (second round)| Semifinals | Final | ||||||||||||
| 1 | Juan Pablo Varillas | 6 | 6 | ||||||||||
| Q |  Kimmer Coppejans | 3 | 4 | ||||||||||
| 1 | Juan Pablo Varillas | 1 | 3 | ||||||||||
| 5 | Luca Van Assche | 6 | 6 | ||||||||||
| 5 | Luca Van Assche | 77 | 6 | ||||||||||
 Vít Kopřiva | 64 | 2 | |||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | JP Varillas | 6 | 77 | ||||||||||||||||||||||||
| Q | F Arnaboldi | 4 | 61 | 1 | JP Varillas | 6 | 1 | 6 | |||||||||||||||||||
| A Pellegrino | 79 | 6 | A Pellegrino | 4 | 6 | 1 | |||||||||||||||||||||
| WC | M Gigante | 67 | 4 | 1 | JP Varillas | 3 | 6 | 6 | |||||||||||||||||||
| Q |  V Vacherot | 3 | 3 | Q | A Vavassori | 6 | 3 | 4 | |||||||||||||||||||
| Q | Edoardo Lavagno | 6 | 6 | Q | E Lavagno | 5 | 65 | ||||||||||||||||||||
| Q | A Vavassori | 4 | 7 | 4 | Q | A Vavassori | 7 | 77 | |||||||||||||||||||
| 7 | P Kotov | 6 | 5 | 0r | 1 | JP Varillas | 6 | 6 | |||||||||||||||||||
| 4 | A Karatsev | 7 | 2 | 3 | Q | K Coppejans | 3 | 4 | |||||||||||||||||||
| Q | K Coppejans | 5 | 6 | 6 | Q | K Coppejans | 6 | 7 | |||||||||||||||||||
| M Guinard | 2 | 3 |  S Ofner | 4 | 5 | ||||||||||||||||||||||
| S Ofner | 6 | 6 | Q | K Coppejans | 6 | 62 | 77 | ||||||||||||||||||||
 J Kovalík | 6 | 6 |  Z Piros | 1 | 77 | 64 | |||||||||||||||||||||
| SE |  B Harris | 2 | 1 | J Kovalík | 3 | 66 | |||||||||||||||||||||
| Z Piros | 6 | 77 | Z Piros | 6 | 78 | ||||||||||||||||||||||
| 6 | M Arnaldi | 3 | 63 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | L Van Assche | 2 | 6 | 6 | |||||||||||||||||||||||
| R Peniston | 6 | 3 | 2 | 5 | L Van Assche | 6 | 6 | ||||||||||||||||||||
| WC | G Ferrari | 1 | 62 | Q | G Fonio | 3 | 3 | ||||||||||||||||||||
| Q | G Fonio | 6 | 77 | 5 | L Van Assche | 6 | 6 | ||||||||||||||||||||
| A Müller | 1 | 6 | 6 | A Müller | 2 | 1 | |||||||||||||||||||||
 K Uchida | 6 | 3 | 3 | A Müller | 7 | 6 | |||||||||||||||||||||
 C-h Tseng | 3 | 3 | 3 | A Shevchenko | 5 | 2 | |||||||||||||||||||||
| 3 | A Shevchenko | 6 | 6 | 5 | L Van Assche | 77 | 6 | ||||||||||||||||||||
| 8 | G Zeppieri | 6 | 6 | V Kopřiva | 64 | 2 | |||||||||||||||||||||
| SE | A Giannessi | 1 | 1 | 8 | G Zeppieri | 64 | 3 | ||||||||||||||||||||
| L Nardi | 4 | 4 | WC | G Mager | 77 | 6 | |||||||||||||||||||||
| WC | G Mager | 6 | 6 | WC | G Mager | 4 | 3 | ||||||||||||||||||||
| F Cobolli | 6 | 6 | V Kopřiva | 6 | 6 | ||||||||||||||||||||||
| F Maestrelli | 4 | 4 | F Cobolli | 3 | 1 | ||||||||||||||||||||||
| V Kopřiva | 6 | 6 | V Kopřiva | 6 | 6 | ||||||||||||||||||||||
| 2 | M Cecchinato | 4 | 4 | ||||||||||||||||||||||||
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Novak Djokovic is the defending champion.