| Men's singles | |
|---|---|
| 2023 Hamburg European Open | |
| 2022 Champion |  Lorenzo Musetti |
| Draw | 32 (4Q / 3WC) |
| Seeds | 8 |
Lorenzo Musetti was the defending champion, [1] but lost to Laslo Djere in the quarterfinals.
| Men's singles | |
|---|---|
| 2023 Hamburg European Open | |
| 2022 Champion | Lorenzo Musetti |
| Draw | 32 (4Q / 3WC) |
| Seeds | 8 |
Lorenzo Musetti was the defending champion, [1] but lost to Laslo Djere in the quarterfinals.
Casper Ruud (quarterfinals)
Andrey Rublev (second round) Lorenzo Musetti (quarterfinals)
Alexander Zverev 
Francisco Cerúndolo (first round, retired) Tomás Martín Etcheverry (first round)
Alejandro Davidovich Fokina (second round)
Miomir Kecmanović (first round)| Semifinals | Final | ||||||||||||
 Arthur Fils | 2 | 4 | |||||||||||
| 4 | Alexander Zverev | 6 | 6 | ||||||||||
| 4 | Alexander Zverev | ||||||||||||
| Laslo Djere | |||||||||||||
| Laslo Djere | 6 | 6 | |||||||||||
 Zhang Zhizhen | 3 | 2 | |||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | C Ruud | 6 | 1 | 6 | |||||||||||||||||||||||
| S Báez | 3 | 6 | 3 | 1 | C Ruud | 1 | 6 | 6 | |||||||||||||||||||
| PR |  H Dellien | 77 | 1 | 3 | Q |  C Garín | 6 | 2 | 2 | ||||||||||||||||||
| Q | C Garín | 63 | 6 | 6 | 1 | C Ruud | 0 | 4 | |||||||||||||||||||
| A Fils | 7 | 7 | A Fils | 6 | 6 | ||||||||||||||||||||||
| LL |  DE Galán | 5 | 5 | A Fils | 7 | 7 | |||||||||||||||||||||
| D Lajović | 3 | 6 | 6 | D Lajović | 5 | 5 | |||||||||||||||||||||
| 8 | M Kecmanović | 6 | 4 | 3 | A Fils | 2 | 4 | ||||||||||||||||||||
| 4 | A Zverev | 6 | 6 | 4 | A Zverev | 6 | 6 | ||||||||||||||||||||
 A Molčan | 0 | 3 | 4 | A Zverev | 6 | 7 | |||||||||||||||||||||
| WC | M Marterer | 77 | 6 | WC | M Marterer | 3 | 5 | ||||||||||||||||||||
| WC | R Molleker | 62 | 2 | 4 | A Zverev | 6 | 6 | ||||||||||||||||||||
| L Van Assche | 77 | 6 | L Van Assche | 3 | 4 | ||||||||||||||||||||||
| A Müller | 63 | 4 | L Van Assche | 3 | 77 | 6 | |||||||||||||||||||||
| P Cachin | 6 | 5 | 2 | 7 | A Davidovich Fokina | 6 | 65 | 4 | |||||||||||||||||||
| 7 | A Davidovich Fokina | 2 | 7 | 6 | |||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 6 | TM Etcheverry | 62 | 3 | ||||||||||||||||||||||||
| L Djere | 77 | 6 | L Djere | 6 | 3 | 6 | |||||||||||||||||||||
| LL |  T Monteiro | 3 | 6 | 4 | PR | G Pella | 2 | 6 | 3 | ||||||||||||||||||
| PR | G Pella | 6 | 4 | 6 | L Djere | 7 | 6 | ||||||||||||||||||||
| Q | T Seyboth Wild | 66 | 4 | 3 | L Musetti | 5 | 3 | ||||||||||||||||||||
| LL | J Kovalík | 78 | 6 | LL | J Kovalík | 6 | 2 | 4 | |||||||||||||||||||
| Q |  E Ymer | 4 | 1 | 3 | L Musetti | 3 | 6 | 6 | |||||||||||||||||||
| 3 | L Musetti | 6 | 6 | L Djere | 6 | 6 | |||||||||||||||||||||
| 5 | F Cerúndolo | 6 | 2 | 2r | Z Zhang | 3 | 2 | ||||||||||||||||||||
| Y Hanfmann | 4 | 6 | 4 | Y Hanfmann | 6 | 1 | 4 | ||||||||||||||||||||
| Q |  J Choinski | 4 | 5 | Z Zhang | 4 | 6 | 6 | ||||||||||||||||||||
| Z Zhang | 6 | 7 | Z Zhang | 6 | 6 | ||||||||||||||||||||||
| D Altmaier | 7 | 6 | D Altmaier | 4 | 4 | ||||||||||||||||||||||
| R Gasquet | 5 | 4 | D Altmaier | 6 | 6 | ||||||||||||||||||||||
| B Zapata Miralles | 7 | 1 | 67 | 2/WC | A Rublev | 2 | 2 | ||||||||||||||||||||
| 2/WC | A Rublev | 5 | 6 | 79 | |||||||||||||||||||||||
Daniel Elahi Galán (qualifying competition, lucky loser) Pavel Kotov (first round) Cristian Garín (qualified) Thiago Seyboth Wild (qualified) Thiago Monteiro (qualifying competition, lucky loser) Thiago Agustín Tirante (first round) Jan Choinski (qualified) Ivan Gakhov (first round)| First round | Qualifying competition | ||||||||||||
| 1 | Daniel Elahi Galán | 4 | 77 | 6 | |||||||||
| WC | Max Hans Rehberg | 6 | 65 | 3 | |||||||||
| 1 | Daniel Elahi Galán | 1 | 6 | 4 | |||||||||
| 7 | Jan Choinski | 6 | 4 | 6 | |||||||||
| WC | Marvin Möller | 3 | 4 | ||||||||||
| 7 | Jan Choinski | 6 | 6 | ||||||||||
| First round | Qualifying competition | ||||||||||||
| 2 | Pavel Kotov | 3 | 7 | 4 | |||||||||
| Jozef Kovalík | 6 | 5 | 6 | ||||||||||
| Jozef Kovalík | 3 | 3 | |||||||||||
| Elias Ymer | 6 | 6 | |||||||||||
| Elias Ymer | 6 | 6 | |||||||||||
| 8 | Ivan Gakhov | 3 | 2 | ||||||||||
| First round | Qualifying competition | ||||||||||||
| 3 | Cristian Garín | 6 | 6 | ||||||||||
| WC | Marko Topo | 3 | 4 | ||||||||||
| 3 | Cristian Garín | 2 | 6 | 77 | |||||||||
 Kimmer Coppejans | 6 | 3 | 65 | ||||||||||
| Kimmer Coppejans | 6 | 77 | |||||||||||
| 6 | Thiago Agustín Tirante | 1 | 64 | ||||||||||
| First round | Qualifying competition | ||||||||||||
| 4 | Thiago Seyboth Wild | 6 | 6 | ||||||||||
| Andrea Collarini | 4 | 4 | |||||||||||
| 4 | Thiago Seyboth Wild | 6 | 6 | ||||||||||
| 5 | Thiago Monteiro | 4 | 3 | ||||||||||
| Alt | Renzo Olivo | 62 | 0r | ||||||||||
| 5 | Thiago Monteiro | 77 | 0 | ||||||||||
Wu Yibing was the defending champion, but was no longer eligible to participate in junior tournaments.
Alexander Zverev was the two-time defending champion, but lost to Cristian Garín in the quarterfinals.
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.
Cristian Garín was the defending champion but chose not to defend his title.
Fabio Fognini was the champion in 2014, when the event was last held, but chose to compete in Dubai instead.
Ilya Ivashka was the defending champion but chose not to defend his title.
This was the first edition of the tournament and first of two editions of the tournament to start the 2021 ATP Challenger Tour year.
Jaume Munar was the defending champion but lost in the final to Carlos Taberner 4–6, 1–6.
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.
Alexander Zverev defeated top seed Stefanos Tsitsipas in the final, 6–4, 7–6(7–3) to win the men's singles tennis title at the 2021 Mexican Open.
Hubert Hurkacz defeated Jannik Sinner in the final, 7–6(7–4), 6–4 to win the men's singles tennis title at the 2021 Miami Open. Hurkacz claimed his first Masters 1000 singles championship and became the first Pole to win a Masters 1000 singles title.
Nikoloz Basilashvili defeated Jan-Lennard Struff in the final, 6–4, 7–6(7–5) to win the men's singles tennis title at the 2021 Bavarian International Tennis Championships. After not dropping a set en route to his victory, Basilashvili earned his second title of the season and his fifth career ATP Tour singles title overall. Struff was in contention to win his first title in his first tour-level final.
Hugo Dellien was the defending champion but lost in the quarterfinals to Juan Manuel Cerúndolo.
Albert Ramos Viñolas defeated Alejandro Tabilo in the final, 4–6, 6–3, 6–4 to win the singles title at the 2022 Córdoba Open.
Carlos Alcaraz defeated Diego Schwartzman in the final, 6–4, 6–2 to win the singles title at the 2022 Rio Open. Alcaraz became the youngest winner of an ATP Tour 500 event since the category was created in 2009.
Lorenzo Musetti defeated Carlos Alcaraz in the final, 6–4, 6–7(6–8), 6–4 to win the men's singles tennis title at the 2022 Hamburg European Open. It was his maiden ATP Tour title, and he saved two match points en route, in his first round match against Dušan Lajović.
Carlos Alcaraz defeated Daniil Medvedev in the final, 6–3, 6–2 to win the men's singles tennis title at the 2023 Indian Wells Masters. He did not drop a set en route to his third ATP Tour Masters 1000 title and eighth career title overall. With the win, he usurped Novak Djokovic for the ATP No. 1 ranking, who was unable to enter the United States due to being unvaccinated for COVID-19. With this victory, Alcaraz ended Medvedev's 19-match winning streak, and Medvedev became the first Russian to make it to a Indian Wells final since Andrei Chesnokov in 1992.
Daniil Medvedev defeated Jannik Sinner in the final, 7–5, 6–3 to win the men's singles tennis title at the 2023 Miami Open. It was his fifth ATP Tour Masters 1000 title, fourth title of 2023, and 19th career title overall. He became only the eighth man to win 5 or more ATP Masters Titles.
Francisco Cerúndolo won the men's singles title, defeating Tommy Paul in the final, 6–4, 1–6, 6–4.
The 2023 Hamburg European Open was a combined men's and women's tennis tournament played on outdoor clay courts. It was the 117th edition of the event for the men and the 21st edition for the women. The tournament was classified as an ATP Tour 500 series on the 2023 ATP Tour and as a WTA 250 tournament on the 2023 WTA Tour. The tournament took place at Am Rothenbaum in Hamburg, Germany between 23 and 30 July 2023.