2021 European Open
Men's indoor tennis tournament
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The 2021 European Open was a men's tennis tournament played on indoor hard courts. It was the sixth edition of the European Open and part of the ATP Tour 250 series of the 2021 ATP Tour. It took place at the Lotto Arena in Antwerp, Belgium, from 18 October until 24 October 2021.[1]
| 2021 European Open | |
|---|---|
| Date | 18–24 October |
| Edition | 6th |
| Category | ATP Tour 250 Series |
| Draw | 28S / 16D |
| Prize money | €508,600 |
| Surface | Hard (indoor) |
| Location | Antwerp, Belgium |
| Venue | Lotto Arena |
| Champions | |
| Singles | |
 Jannik Sinner | |
| Doubles | |
 Nicolas Mahut / Fabrice Martin | |
Finals
Singles
Jannik Sinner defeated 
Diego Schwartzman, 6–2, 6–2
Doubles
Nicolas Mahut / Fabrice Martin defeated 
Wesley Koolhof / Jean-Julien Rojer, 6–0, 6–1
Singles main-draw entrants
Seeds
| Country | Player | Rank1 | Seed |
|---|---|---|---|
| ITA |
Jannik Sinner | 14 | 1 |
 ARG |
Diego Schwartzman | 15 | 2 |
 CHI |
Cristian Garín | 17 | 3 |
 ESP |
Roberto Bautista Agut | 19 | 4 |
 USA |
Reilly Opelka | 20 | 5 |
 AUS |
Alex de Minaur | 27 | 6 |
 RSA |
Lloyd Harris | 31 | 7 |
 SRB |
Dušan Lajović | 35 | 8 |
- Rankings are as of 4 October 2021.[2]
Other entrants
The following players received wildcards into the singles main draw:
The following players received entry from the qualifying draw:
Withdrawals
- Before the tournament
Félix Auger-Aliassime → replaced by 
Alexei Popyrin
Nikoloz Basilashvili → replaced by Gianluca Mager
Pablo Carreño Busta → replaced by Jordan Thompson
Grigor Dimitrov → replaced by Arthur Rinderknech- Fabio Fognini → replaced by Lorenzo Musetti
- Ugo Humbert → replaced by
Jan-Lennard Struff 
Cameron Norrie → replaced by Botic van de Zandschulp
Doubles main-draw entrants
Seeds
| Country | Player | Country | Player | Rank1 | Seed |
|---|---|---|---|---|---|
 CRO |
Ivan Dodig |  BRA |
Marcelo Melo | 33 | 1 |
| FRA |
Nicolas Mahut | FRA |
Fabrice Martin | 44 | 2 |
 NED |
Wesley Koolhof | NED |
Jean-Julien Rojer | 52 | 3 |
 BEL |
Sander Gillé | BEL |
Joran Vliegen | 73 | 4 |
- Rankings are as of 4 October 2021.
Other entrants
The following pairs received wildcards into the doubles main draw:
Withdrawals
- Before the tournament
- Simone Bolelli / Máximo González → replaced by David Pel / Botic van de Zandschulp
- Grigor Dimitrov /
Frederik Nielsen → replaced by Frederik Nielsen / 
Matej Sabanov - Fabio Fognini /
Roman Jebavý → replaced by Roman Jebavý / 
Andrei Vasilevski 
Cristian Garín / David Vega Hernández → replaced by Federico Delbonis / David Vega Hernández- Nikola Mektić / Mate Pavić → replaced by
Jonathan Erlich / 
André Göransson - John Peers /
Filip Polášek → replaced by 
Romain Arneodo / Matt Reid - Tim Pütz /
Michael Venus → replaced by 
Denys Molchanov / 
Aleksandr Nedovyesov
- During the tournament