# 2021 European Open – Singles

Ugo Humbert was the defending champion, but chose not to participate this year.
Jannik Sinner won the title, defeating Diego Schwartzman in the final, 6–2, 6–2.

## Seeds

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)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final |
| 1 | Jannik Sinner | 6 | 6 | | | | |
| 7 | Lloyd Harris | 2 | 2 | | | | |
| 7 | Lloyd Harris | 2 | 2 | 1 | Jannik Sinner | 6 | 6 |
| | | | | 2 | Diego Schwartzman | 2 | 2 |
| Q | Jenson Brooksby | 4 | 0 | 2 | Diego Schwartzman | 2 | 2 |
| 2 | Diego Schwartzman | 6 | 6 | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| | | | | | 1 | J Sinner | 7 | 6 | | | | | | | | | |
| | L Musetti | 7$^7$ | 7$^7$ | | | L Musetti | 5 | 2 | | | | | | | | | |
| | G Mager | 6$^2$ | 6$^3$ | | | | | | | 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 | 6$^3$ | 1 | | 8 | D Lajović | 3 | 6 | 2 | | | | | | | | |
| 8 | D Lajović | 7$^7$ | 6 | | | | | | | | | | | 1 | J Sinner | 6 | 6 |
| | | | | | | | | | | | | | | 7 | L Harris | 2 | 2 |
| | | | | | 4 | R Bautista Agut | 7$^7$ | 3 | 1 | | | | | | | | |
| Q | D Novak | 6$^4$ | 2 | | | M Fucsovics | 6$^5$ | 6 | 6 | | | | | | | | |
| | M Fucsovics | 7$^7$ | 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 | 6$^4$ | 3 | | 7 | L Harris | 6 | 6 | | | | | | | | | |
| 7 | L Harris | 7$^7$ | 6 | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | 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 | 7$^7$ | 6$^5$ | 6 | | | | | | | | |
| Q | H Laaksonen | 4 | 6 | 6 | Q | H Laaksonen | 6$^5$ | 7$^7$ | 3 | | | | | | | | |
| | B Paire | 6 | 0 | 3 | | | | | | Q | B Nakashima | 4 | 2 | | | | |
| | F Tiafoe | 6$^2$ | 7$^9$ | 6$^8$ | | | | | | 2 | D Schwartzman | 6 | 6 | | | | |
| WC | A Murray | 7$^7$ | 6$^7$ | 7$^{10}$ | WC | A Murray | 4 | 6$^6$ | | | | | | | | | |
| | | | | | 2 | D Schwartzman | 6 | 7$^8$ | | | | | | | | | |

## Qualifying
### Seeds

* 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)

### Qualifiers

* Jenson Brooksby
* Brandon Nakashima
* Henri Laaksonen
* Dennis Novak

### Qualifying draw
#### First qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 1 | Jenson Brooksby | 6 | 6 | | | | |
| WC | Michael Geerts | 4 | 2 | | | | |
| WC | Michael Geerts | 4 | 2 | 1 | Jenson Brooksby | 6 | 6 |
| | | | | 8 | Norbert Gombos | 4 | 2 |
| | Bernabé Zapata Miralles | 3 | 2 | 8 | Norbert Gombos | 4 | 2 |
| 8 | Norbert Gombos | 6 | 6 | | | | |

#### Second qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 2 | Brandon Nakashima | 6 | 2 | 6 | | | | |
| | Fernando Verdasco | 4 | 6 | 3 | | | | |
| | 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 | 2 | 4 |
| 6/Alt | Pierre-Hugues Herbert | 6 | 6 | | | | | |

#### Third qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 3 | Roberto Carballés Baena | 6 | 3 | 6 | | | | |
| | Liam Broady | 4 | 6 | 4 | | | | |
| | Liam Broady | 4 | 6 | 4 | 3 | Roberto Carballés Baena | 5 | 1 |
| | | | | | 5 | Henri Laaksonen | 7 | 6 |
| | Yannick Hanfmann | 6 | 6$^3$ | 3 | 5 | Henri Laaksonen | 7 | 6 |
| 5 | Henri Laaksonen | 0 | 7$^7$ | 6 | | | | |

#### Fourth qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 4 | Andreas Seppi | 6 | 7 | | | | | |
| WC | Gauthier Onclin | 4 | 5 | | | | | |
| WC | Gauthier Onclin | 4 | 5 | 4 | Andreas Seppi | 6$^9$ | 6 | 6$^6$ |
| | | | | 7 | Dennis Novak | 7$^{11}$ | 3 | 7$^8$ |
| | Jozef Kovalík | 0 | 1 | 7 | Dennis Novak | 7$^{11}$ | 3 | 7$^8$ |
| 7 | Dennis Novak | 6 | 6 | | | | | |