| Singles | |
|---|---|
| 2021 European Open | |
| Champion |  Jannik Sinner |
| Runner-up |  Diego Schwartzman |
| Score | 6–2, 6–2 |
| Draw | 28 (4 Q / 3 WC ) |
| Seeds | 8 |
Ugo Humbert was the defending champion, but chose not to participate this year. [1]
Jannik Sinner won the title, defeating Diego Schwartzman in the final, 6–2, 6–2.
The top four seeds received a bye into the second round.
Jannik Sinner (champion) Diego Schwartzman (final)
Cristian Garín (second round)
Roberto Bautista Agut (second round)
Reilly Opelka (first round)
Alex de Minaur (first round)
Lloyd Harris (semifinals)
Dušan Lajović (second round)| Semifinals | Final | ||||||||||||
| 1 | Jannik Sinner | 6 | 6 | ||||||||||
| 7 | Lloyd Harris | 2 | 2 | ||||||||||
| 1 | Jannik Sinner | 6 | 6 | ||||||||||
| 2 | Diego Schwartzman | 2 | 2 | ||||||||||
| Q | Jenson Brooksby | 4 | 0 | ||||||||||
| 2 | Diego Schwartzman | 6 | 6 | ||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 1 | J Sinner | 7 | 6 | ||||||||||||||||||||||||
| L Musetti | 77 | 77 | L Musetti | 5 | 2 | ||||||||||||||||||||||
| G Mager | 62 | 63 | 1 | J Sinner | 6 | 6 | |||||||||||||||||||||
| F Delbonis | 4 | 4 |  A Rinderknech | 4 | 2 | ||||||||||||||||||||||
| A Rinderknech | 6 | 6 | A Rinderknech | 6 | 4 | 6 | |||||||||||||||||||||
| WC | R Gasquet | 63 | 1 | 8 | D Lajović | 3 | 6 | 2 | |||||||||||||||||||
| 8 | D Lajović | 77 | 6 | 1 | J Sinner | 6 | 6 | ||||||||||||||||||||
| 7 | L Harris | 2 | 2 | ||||||||||||||||||||||||
| 4 | R Bautista Agut | 77 | 3 | 1 | |||||||||||||||||||||||
| Q |  D Novak | 64 | 2 |  M Fucsovics | 65 | 6 | 6 | ||||||||||||||||||||
| M Fucsovics | 77 | 6 | M Fucsovics | 2 | 5 | ||||||||||||||||||||||
 J-L Struff | 6 | 3 | 6 | 7 | L Harris | 6 | 7 | ||||||||||||||||||||
| A Ramos Viñolas | 3 | 6 | 3 | J-L Struff | 2 | 3 | |||||||||||||||||||||
| WC |  Z Bergs | 64 | 3 | 7 | L Harris | 6 | 6 | ||||||||||||||||||||
| 7 | L Harris | 77 | 6 | ||||||||||||||||||||||||
| First round | Second round | Quarterfinals | Semifinals | ||||||||||||||||||||||||
| 5 | R Opelka | 4 | 4 | ||||||||||||||||||||||||
| Q | J Brooksby | 6 | 6 | Q | J Brooksby | 6 | 6 | ||||||||||||||||||||
| A Popyrin | 4 | 6 | 0 |  B van de Zandschulp | 2 | 0 | |||||||||||||||||||||
| B van de Zandschulp | 6 | 3 | 6 | Q | J Brooksby | 7 | 6 | ||||||||||||||||||||
| A Davidovich Fokina | 6 | 6 | A Davidovich Fokina | 5 | 0 | ||||||||||||||||||||||
| J Thompson | 3 | 3 | A Davidovich Fokina | 4 | 6 | 6 | |||||||||||||||||||||
| 3 | C Garín | 6 | 3 | 3 | |||||||||||||||||||||||
| Q | J Brooksby | 4 | 0 | ||||||||||||||||||||||||
| 6 | A de Minaur | 4 | 0 | 2 | D Schwartzman | 6 | 6 | ||||||||||||||||||||
| Q | B Nakashima | 6 | 6 | Q | B Nakashima | 77 | 65 | 6 | |||||||||||||||||||
| Q |  H Laaksonen | 4 | 6 | 6 | Q | H Laaksonen | 65 | 77 | 3 | ||||||||||||||||||
| B Paire | 6 | 0 | 3 | Q | B Nakashima | 4 | 2 | ||||||||||||||||||||
| F Tiafoe | 62 | 79 | 68 | 2 | D Schwartzman | 6 | 6 | ||||||||||||||||||||
| WC |  A Murray | 77 | 67 | 710 | WC | A Murray | 4 | 66 | |||||||||||||||||||
| 2 | D Schwartzman | 6 | 78 | ||||||||||||||||||||||||
Jenson Brooksby (qualified) Brandon Nakashima (qualified) Roberto Carballés Baena (qualifying competition) Andreas Seppi (qualifying competition) Henri Laaksonen (qualified) Pierre-Hugues Herbert (qualifying competition) Dennis Novak (qualified)
Norbert Gombos (qualifying competition)| First round | Qualifying competition | ||||||||||||
| 1 | Jenson Brooksby | 6 | 6 | ||||||||||
| WC | Michael Geerts | 4 | 2 | ||||||||||
| 1 | Jenson Brooksby | 6 | 6 | ||||||||||
| 8 | Norbert Gombos | 4 | 2 | ||||||||||
| Bernabé Zapata Miralles | 3 | 2 | |||||||||||
| 8 | Norbert Gombos | 6 | 6 | ||||||||||
| First round | Qualifying competition | ||||||||||||
| 2 | Brandon Nakashima | 6 | 2 | 6 | |||||||||
| Fernando Verdasco | 4 | 6 | 3 | ||||||||||
| 2 | Brandon Nakashima | 6 | 6 | ||||||||||
| 6/Alt | Pierre-Hugues Herbert | 2 | 4 | ||||||||||
 Holger Rune | 3 | 4 | |||||||||||
| 6/Alt | Pierre-Hugues Herbert | 6 | 6 | ||||||||||
| First round | Qualifying competition | ||||||||||||
| 3 | Roberto Carballés Baena | 6 | 3 | 6 | |||||||||
| Liam Broady | 4 | 6 | 4 | ||||||||||
| 3 | Roberto Carballés Baena | 5 | 1 | ||||||||||
| 5 | Henri Laaksonen | 7 | 6 | ||||||||||
| Yannick Hanfmann | 6 | 63 | 3 | ||||||||||
| 5 | Henri Laaksonen | 0 | 77 | 6 | |||||||||
| First round | Qualifying competition | ||||||||||||
| 4 | Andreas Seppi | 6 | 7 | ||||||||||
| WC | Gauthier Onclin | 4 | 5 | ||||||||||
| 4 | Andreas Seppi | 69 | 6 | 66 | |||||||||
| 7 | Dennis Novak | 711 | 3 | 78 | |||||||||
| Jozef Kovalík | 0 | 1 | |||||||||||
| 7 | Dennis Novak | 6 | 6 | ||||||||||
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