| Men's singles | |
|---|---|
| 2024 Iași Open | |
| Champion |  Hugo Dellien |
| Runner-up |  Javier Barranco Cosano |
| Score | 6–1, 6–1 |
Hugo Gaston was the defending champion [1] but chose not to defend his title.
Hugo Dellien won the title after defeating Javier Barranco Cosano 6–1, 6–1 in the final. [2]
Camilo Ugo Carabelli (second round) Albert Ramos Viñolas (first round) Juan Manuel Cerúndolo (second round) Román Andrés Burruchaga (first round)
Nicolas Moreno de Alboran (first round) Hugo Dellien (champion) 
Gustavo Heide (first round)
Enzo Couacaud (semifinals)| Semifinals | Final | ||||||||||||
| 6 | Hugo Dellien | 77 | 6 | ||||||||||
 Daniel Vallejo | 64 | 2 | |||||||||||
| 6 | Hugo Dellien | 6 | 6 | ||||||||||
| Javier Barranco Cosano | 1 | 1 | |||||||||||
| 8 | Enzo Couacaud | 65 | 5 | ||||||||||
| Javier Barranco Cosano | 77 | 7 | |||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | C Ugo Carabelli | 7 | 6 | ||||||||||||||||||||||||
 J Veselý | 5 | 3 | 1 | C Ugo Carabelli | 63 | 2 | |||||||||||||||||||||
| Q |  Radu Mihai Papoe | 1 | 2 | V Royer | 77 | 6 | |||||||||||||||||||||
| V Royer | 6 | 6 | V Royer | 4 | 77 | 3 | |||||||||||||||||||||
| Q | Sebastian Gima | 0 | 66 | 6 | H Dellien | 6 | 65 | 6 | |||||||||||||||||||
 A Shelbayh | 6 | 78 | A Shelbayh | 4 | 4 | ||||||||||||||||||||||
| LL |  R Strombachs | 5 | 6 | 4 | 6 | H Dellien | 6 | 6 | |||||||||||||||||||
| 6 | H Dellien | 7 | 4 | 6 | 6 | H Dellien | 77 | 6 | |||||||||||||||||||
| 3 | JM Cerúndolo | 6 | 6 | AD Vallejo | 64 | 2 | |||||||||||||||||||||
| Q |  I Snițari | 4 | 3 | 3 | JM Cerúndolo | 3 | 3 | ||||||||||||||||||||
| AD Vallejo | 6 | 6 | AD Vallejo | 6 | 6 | ||||||||||||||||||||||
| Q | AL Lingua Lavallén | 4 | 4 | AD Vallejo | 6 | 6 | |||||||||||||||||||||
| Q | M Vrbenský | 6 | 3 | 1 | M Landaluce | 2 | 1 | ||||||||||||||||||||
| M Landaluce | 1 | 6 | 6 | M Landaluce | 6 | 6 | |||||||||||||||||||||
| WC | GA Boitan | 77 | 3 | 6 | WC | GA Boitan | 4 | 3 | |||||||||||||||||||
| 5 | N Moreno de Alboran | 65 | 6 | 4 | |||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 8 | E Couacaud | 4 | 6 | 6 | |||||||||||||||||||||||
 N Fatić | 6 | 3 | 4 | 8 | E Couacaud | 6 | 5 | 6 | |||||||||||||||||||
| M Janvier | 3 | 6 | 3 | D Svrčina | 0 | 7 | 2 | ||||||||||||||||||||
| D Svrčina | 6 | 3 | 6 | 8 | E Couacaud | 64 | 6 | 712 | |||||||||||||||||||
 D Popko | 6 | 6 | D Popko | 77 | 2 | 610 | |||||||||||||||||||||
| M Dellien | 4 | 2 | D Popko | 7 | 6 | ||||||||||||||||||||||
| WC | C Crețu | 6 | 6 | WC | C Crețu | 5 | 3 | ||||||||||||||||||||
| 4 | RA Burruchaga | 4 | 3 | 8 | E Couacaud | 65 | 5 | ||||||||||||||||||||
| 7 | G Heide | 79 | 2 | 3 | J Barranco Cosano | 77 | 7 | ||||||||||||||||||||
| Alt |  V Sachko | 67 | 6 | 6 | Alt | V Sachko | 4 | 4 | |||||||||||||||||||
| J Barranco Cosano | 6 | 6 | J Barranco Cosano | 6 | 6 | ||||||||||||||||||||||
| WC | ND Ionel | 1 | 2 | J Barranco Cosano | 77 | 6 | |||||||||||||||||||||
| Q |  B Bobrov | 77 | 5 | JP Ficovich | 61 | 3 | |||||||||||||||||||||
| Alt | FC Jianu | 61 | 2r | Q | B Bobrov | 6 | 1 | 2 | |||||||||||||||||||
| JP Ficovich | 78 | 6 | JP Ficovich | 4 | 6 | 6 | |||||||||||||||||||||
| 2 | A Ramos Viñolas | 66 | 4 | ||||||||||||||||||||||||
Jack Sock was the defending champion, but participated in the men's main draw, as he was ineligible to defend his title.
Tennys Sandgren was the defending champion but chose not to defend his title.
Márton Fucsovics was the defending champion but chose not to defend his title.
Filip Krajinović was the defending champion but chose not to defend his title.
Dominic Thiem was the defending champion, but lost to Diego Schwartzman in the semifinals.
Laslo Đere won the title – the first of his career – defeating Félix Auger-Aliassime in the final, 6–3, 7–5. No seeded players reached the quarterfinals, and only one seed won his first-round match.
Nikoloz Basilashvili was the defending champion and successfully defended his title, defeating Andrey Rublev in the final, 7–5, 4–6, 6–3. En route to doing so, Basilashvili saved two match points against Alexander Zverev in the semifinals.
Martin Kližan was the defending champion but lost in the first round to Matthias Bachinger.
Roger Federer was the two-time defending champion and successfully defended his title, defeating Alex de Minaur in the final, 6–2, 6–2. He did not lose a single set in the entire tournament. The victory made Federer the first player in ATP history to win 10 same tournament titles on two different surfaces. It was his 103rd and final ATP title before announcing his retirement in 2022.
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.
Henri Laaksonen was the defending champion but chose not to defend his title.
Andrea Pellegrino was the defending champion but lost in the quarterfinals to Flavio Cobolli.
Daniel Masur was the defending champion but chose not to defend his title.
Hugo Dellien was the defending champion but chose not to defend his title.
Daniel Elahi Galán 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.
Casper Ruud defeated the defending champion Diego Schwartzman in the final, 5–7, 6–2, 6–3 to win the singles title at the 2022 Argentina Open.
Sebastián Báez 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.
Sebastián Báez defeated Frances Tiafoe in the final, 6–3, 6–2 to win the singles tennis title at the 2022 Estoril Open. It was his maiden ATP Tour title.