| Singles | |
|---|---|
| 2023 San Marino Open | |
| Champion |  Jaume Munar |
| Runner-up |  Andrea Pellegrino |
| Score | 6–4, 6–1 |
Pavel Kotov was the defending champion [1] but chose not to defend his title.
Jaume Munar won the title after defeating Andrea Pellegrino 6–4, 6–1 in the final.
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)| Semifinals | Final | ||||||||||||
| Andrea Pellegrino | 3 | 6 | 0 | ||||||||||
 Nerman Fatić | 6 | 3 | 0r | ||||||||||
| Andrea Pellegrino | 4 | 1 | |||||||||||
| 2 | Jaume Munar | 6 | 6 | ||||||||||
| Daniel Rincón | 6 | 1 | 2 | ||||||||||
| 2 | Jaume Munar | 0 | 6 | 6 | |||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | A Müller | 3 | 4 | ||||||||||||||||||||||||
| Q | E Dalla Valle | 6 | 6 | Q | E Dalla Valle | 4 | 6 | 1 | |||||||||||||||||||
 A Dougaz | 3 | 1r | A Pellegrino | 6 | 1 | 6 | |||||||||||||||||||||
| A Pellegrino | 6 | 4 | A Pellegrino | 77 | 77 | ||||||||||||||||||||||
| Q | Alexander Weis | 7 | 1 | Q | A Weis | 63 | 63 | ||||||||||||||||||||
| G Mager | 5 | 1r | Q | A Weis | 6 | 3 | 77 | ||||||||||||||||||||
| Q |  V Vacherot | 6 | 6 | Q | V Vacherot | 4 | 6 | 63 | |||||||||||||||||||
| 7 | Z Kolář | 2 | 3 | A Pellegrino | 3 | 6 | 0 | ||||||||||||||||||||
| 3 | D Goffin | 6 | 7 | N Fatić | 6 | 3 | 0r | ||||||||||||||||||||
| F Gaio | 2 | 5 | 3 | D Goffin | 60 | 6 | 6 | ||||||||||||||||||||
 V Sachko | 6 | 2 | 6 | V Sachko | 77 | 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 | |||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | K Coppejans | 6 | 6 | ||||||||||||||||||||||||
 DN Mădăraș | 4 | 4 | 6 | K Coppejans | 3 | 2 | |||||||||||||||||||||
| D Rincón | 77 | 77 | D Rincón | 6 | 6 | ||||||||||||||||||||||
| Q | Marcello Serafini | 65 | 64 | D Rincón | 64 | 6 | 6 | ||||||||||||||||||||
| WC |  M De Rossi | 3 | 4 | 4/WC | F Fognini | 77 | 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 | ||||||||||||||||||||||||
Cristian Garín was the defending champion, having won the event in 2013, but decided not to compete.
Benjamin Bonzi and Quentin Halys were the defending champions, but were not eligible to compete this year.
Alexander Zverev was the defending champion, but chose not to participate this year.
Fabio Fognini was the defending champion, but chose not to defend his title.
Jaume Munar was the defending champion but chose not to defend his title.
Kimmer Coppejans was the defending champion but lost in the quarterfinals to Alejandro Davidovich Fokina.
Guido Pella was the defending champion but chose not to defend his title.
Salvatore Caruso was the defending champion and chose not to defend his title.
Diego Schwartzman defeated Francisco Cerúndolo in the final, 6–1, 6–2 to win the men's singles tennis title at the 2021 Argentina Open.
Roberto Carballés Baena and Alejandro Davidovich Fokina were the defending champions, but Davidovich Fokina chose to participate in Marseille instead. Carballés Baena partnered Federico Coria but lost in the first round to Raven Klaasen and Ben McLachlan.
Pedro Martínez was the defending champion but chose not to defend his title.
Albert Ramos Viñolas defeated Cameron Norrie in the final, 4–6, 6–3, 7–6(7–3) to win the singles tennis title at the 2021 Estoril Open. It marked his third career ATP Tour singles title, all of which have been on clay. Norrie was aiming to win his first ATP Tour title in his second final.
Jaume Munar was the defending champion but chose not to defend his title.
Jaume Munar was the defending champion but lost in the semifinals to Juan Ignacio Londero.
Gianluca Mager was the defending champion but chose not to defend his title.
Defending champion Stefanos Tsitsipas defeated Alejandro Davidovich Fokina in the final, 6–3, 7–6(7–3) to win the singles tennis title at the 2022 Monte-Carlo Masters. He became the sixth player to win consecutive titles at the Monte-Carlo Masters in the Open Era. The win also earned him his second Masters 1000 title and his eighth career singles title overall.
Tomás Martín Etcheverry was the defending champion but lost in the final to Jaume Munar.
Daniel Altmaier was the defending champion but chose not to defend his title.
Jaume Munar was the defending champion but lost in the quarterfinals to Alexandre Müller.
Jan-Lennard Struff was the defending champion but chose not to defend his title.