2021 Erste Bank Open – Singles

{{one source|date=January 2022}}

{{Tennis events|2021|Erste Bank Open|

| champ = {{flagicon|GER}} Alexander Zverev

| runner = {{flagicon|USA}} Frances Tiafoe

| score = 7–5, 6–4

| draw = 32 (4{{abbr| Q | Qualifiers}} / 3{{abbr| WC | Wild Cards}})

| seeds = 8

| type = singles doubles

| before_name = Erste Bank Open – Singles

| after_name = Erste Bank Open – Singles

| main_name = Vienna Open

}}

{{main|2021 Erste Bank Open}}

Andrey Rublev was the defending champion,{{cite web|url=https://www.atptour.com/en/news/rublev-sonego-vienna-2020-singles-final|title=Rublev Claims Fifth Title Of 2020 In Vienna|website=ATP Tour|date=1 November 2020}} but chose to compete in St. Petersburg instead.

Alexander Zverev won the title, defeating Frances Tiafoe in the final, 7–5, 6–4.

Seeds

{{columns-list|colwidth=30em|

  1. {{flagicon|GRE}} Stefanos Tsitsipas (second round)
  2. {{flagicon|GER}} Alexander Zverev (champion)
  3. {{flagicon|ITA}} Matteo Berrettini (quarterfinals)
  4. {{flagicon|NOR}} Casper Ruud (quarterfinals)
  5. {{flagicon|POL}} Hubert Hurkacz (first round)
  6. {{flagicon|CAN}} Félix Auger-Aliassime (quarterfinals)
  7. {{flagicon|ITA}} Jannik Sinner (semifinals)
  8. {{flagicon|ARG}} Diego Schwartzman (quarterfinals)

}}

Draw

{{Draw key}}

=Finals=

{{4TeamBracket-Tennis3

| RD1=Semifinals

| RD2=Final

| team-width=175

| RD1-seed1=Q

| RD1-team1={{flagicon|USA}} Frances Tiafoe

| RD1-score1-1=3

| RD1-score1-2=7

| RD1-score1-3=6

| RD1-seed2=7

| RD1-team2={{flagicon|ITA}} Jannik Sinner

| RD1-score2-1=6

| RD1-score2-2=5

| RD1-score2-3=2

| RD1-seed3=

| RD1-team3={{flagicon|ESP}} Carlos Alcaraz

| RD1-score3-1=3

| RD1-score3-2=3

| RD1-score3-3=

| RD1-seed4=2

| RD1-team4={{flagicon|GER}} Alexander Zverev

| RD1-score4-1=6

| RD1-score4-2=6

| RD1-score4-3=

| RD2-seed1=Q

| RD2-team1={{flagicon|USA}} Frances Tiafoe

| RD2-score1-1=5

| RD2-score1-2=4

| RD2-score1-3=

| RD2-seed2=2

| RD2-team2={{flagicon|GER}} Alexander Zverev

| RD2-score2-1=7

| RD2-score2-2=6

| RD2-score2-3=

}}

=Top half=

{{16TeamBracket-Compact-Tennis3

| RD1=First round

| RD2=Second round

| RD3=Quarterfinals

| RD4=Semifinals

| RD1-seed01=1

| RD1-team01={{flagicon|GRE}} S Tsitsipas

| RD1-score01-1=78

| RD1-score01-2=6

| RD1-score01-3=

| RD1-seed02=

| RD1-team02={{flagicon|BUL}} G Dimitrov

| RD1-score02-1=66

| RD1-score02-2=4

| RD1-score02-3=

| RD1-seed03=

| RD1-team03={{flagicon|SRB}} D Lajović

| RD1-score03-1=4

| RD1-score03-2=4

| RD1-score03-3=

| RD1-seed04=Q

| RD1-team04={{flagicon|USA}} F Tiafoe

| RD1-score04-1=6

| RD1-score04-2=6

| RD1-score04-3=

| RD1-seed05=

| RD1-team05={{flagicon|FRA}} G Monfils

| RD1-score05-1=77

| RD1-score05-2=6

| RD1-score05-3=

| RD1-seed06=WC

| RD1-team06={{flagicon|ITA}} L Musetti

| RD1-score06-1=62

| RD1-score06-2=4

| RD1-score06-3=

| RD1-seed07=

| RD1-team07={{flagicon|ITA}} F Fognini

| RD1-score07-1=2

| RD1-score07-2=5

| RD1-score07-3=

| RD1-seed08=8

| RD1-team08={{flagicon|ARG}} D Schwartzman

| RD1-score08-1=6

| RD1-score08-2=7

| RD1-score08-3=

| RD1-seed09=4

| RD1-team09={{flagicon|NOR}} C Ruud

| RD1-score09-1=7

| RD1-score09-2=77

| RD1-score09-3=

| RD1-seed10=

| RD1-team10={{flagicon|RSA}} L Harris

| RD1-score10-1=5

| RD1-score10-2=62

| RD1-score10-3=

| RD1-seed11=

| RD1-team11={{flagicon|ITA}} L Sonego

| RD1-score11-1=6

| RD1-score11-2=6

| RD1-score11-3=

| RD1-seed12=LL

| RD1-team12={{flagicon|GER}} D Koepfer

| RD1-score12-1=4

| RD1-score12-2=3

| RD1-score12-3=

| RD1-seed13=WC

| RD1-team13={{flagicon|AUT}} D Novak

| RD1-score13-1=77

| RD1-score13-2=77

| RD1-score13-3=

| RD1-seed14=Q

| RD1-team14={{flagicon|ITA}} G Mager

| RD1-score14-1=64

| RD1-score14-2=64

| RD1-score14-3=

| RD1-seed15=

| RD1-team15={{flagicon|USA}} R Opelka

| RD1-score15-1=4

| RD1-score15-2=2

| RD1-score15-3=

| RD1-seed16=7

| RD1-team16={{flagicon|ITA}} J Sinner

| RD1-score16-1=6

| RD1-score16-2=6

| RD1-score16-3=

| RD2-seed01=1

| RD2-team01={{flagicon|GRE}} S Tsitsipas

| RD2-score01-1=6

| RD2-score01-2=3

| RD2-score01-3=4

| RD2-seed02=Q

| RD2-team02={{flagicon|USA}} F Tiafoe

| RD2-score02-1=3

| RD2-score02-2=6

| RD2-score02-3=6

| RD2-seed03=

| RD2-team03={{flagicon|FRA}} G Monfils

| RD2-score03-1=65

| RD2-score03-2=6

| RD2-score03-3=2

| RD2-seed04=8

| RD2-team04={{flagicon|ARG}} D Schwartzman

| RD2-score04-1=77

| RD2-score04-2=4

| RD2-score04-3=6

| RD2-seed05=4

| RD2-team05={{flagicon|NOR}} C Ruud

| RD2-score05-1=7

| RD2-score05-2=4

| RD2-score05-3=6

| RD2-seed06=

| RD2-team06={{flagicon|ITA}} L Sonego

| RD2-score06-1=5

| RD2-score06-2=6

| RD2-score06-3=4

| RD2-seed07=WC

| RD2-team07={{flagicon|AUT}} D Novak

| RD2-score07-1=4

| RD2-score07-2=2

| RD2-score07-3=

| RD2-seed08=7

| RD2-team08={{flagicon|ITA}} J Sinner

| RD2-score08-1=6

| RD2-score08-2=6

| RD2-score08-3=

| RD3-seed01=Q

| RD3-team01={{flagicon|USA}} F Tiafoe

| RD3-score01-1=6

| RD3-score01-2=78

| RD3-score01-3=

| RD3-seed02=8

| RD3-team02={{flagicon|ARG}} D Schwartzman

| RD3-score02-1=4

| RD3-score02-2=66

| RD3-score02-3=

| RD3-seed03=4

| RD3-team03={{flagicon|NOR}} C Ruud

| RD3-score03-1=5

| RD3-score03-2=1

| RD3-score03-3=

| RD3-seed04=7

| RD3-team04={{flagicon|ITA}} J Sinner

| RD3-score04-1=7

| RD3-score04-2=6

| RD3-score04-3=

| RD4-seed01=Q

| RD4-team01={{flagicon|USA}} F Tiafoe

| RD4-score01-1=3

| RD4-score01-2=7

| RD4-score01-3=6

| RD4-seed02=7

| RD4-team02={{flagicon|ITA}} J Sinner

| RD4-score02-1=6

| RD4-score02-2=5

| RD4-score02-3=2

}}

=Bottom half=

{{16TeamBracket-Compact-Tennis3

| RD1=First round

| RD2=Second round

| RD3=Quarterfinals

| RD4=Semifinals

| RD1-seed01=5

| RD1-team01={{flagicon|POL}} H Hurkacz

| RD1-score01-1=4

| RD1-score01-2=78

| RD1-score01-3=3

| RD1-seed02=WC

| RD1-team02={{flagicon|GBR}} A Murray

| RD1-score02-1=6

| RD1-score02-2=66

| RD1-score02-3=6

| RD1-seed03=

| RD1-team03={{flagicon|ESP}} C Alcaraz

| RD1-score03-1=6

| RD1-score03-2=6

| RD1-score03-3=

| RD1-seed04=

| RD1-team04={{flagicon|GBR}} D Evans

| RD1-score04-1=4

| RD1-score04-2=3

| RD1-score04-3=

| RD1-seed05=

| RD1-team05={{flagicon|GEO}} N Basilashvili

| RD1-score05-1=7

| RD1-score05-2=4

| RD1-score05-3=6

| RD1-seed06=

| RD1-team06={{flagicon|ESP}} P Carreño Busta

| RD1-score06-1=5

| RD1-score06-2=6

| RD1-score06-3=3

| RD1-seed07=Q

| RD1-team07={{flagicon|AUS}} A Popyrin

| RD1-score07-1=63

| RD1-score07-2=3

| RD1-score07-3=

| RD1-seed08=3

| RD1-team08={{flagicon|ITA}} M Berrettini

| RD1-score08-1=77

| RD1-score08-2=6

| RD1-score08-3=

| RD1-seed09=6

| RD1-team09={{flagicon|CAN}} F Auger-Aliassime

| RD1-score09-1=6

| RD1-score09-2=6

| RD1-score09-3=

| RD1-seed10=SE

| RD1-team10={{flagicon|LTU}} R Berankis

| RD1-score10-1=3

| RD1-score10-2=2

| RD1-score10-3=

| RD1-seed11=

| RD1-team11={{flagicon|GBR}} C Norrie

| RD1-score11-1=77

| RD1-score11-2=6

| RD1-score11-3=

| RD1-seed12=

| RD1-team12={{flagicon|HUN}} M Fucsovics

| RD1-score12-1=64

| RD1-score12-2=1

| RD1-score12-3=

| RD1-seed13=

| RD1-team13={{flagicon|AUS}} A de Minaur

| RD1-score13-1=6

| RD1-score13-2=77

| RD1-score13-3=

| RD1-seed14=Q

| RD1-team14={{flagicon|RSA}} K Anderson

| RD1-score14-1=3

| RD1-score14-2=63

| RD1-score14-3=

| RD1-seed15=

| RD1-team15={{flagicon|SRB}} F Krajinović

| RD1-score15-1=2

| RD1-score15-2=5

| RD1-score15-3=

| RD1-seed16=2

| RD1-team16={{flagicon|GER}} A Zverev

| RD1-score16-1=6

| RD1-score16-2=7

| RD1-score16-3=

| RD2-seed01=WC

| RD2-team01={{flagicon|GBR}} A Murray

| RD2-score01-1=3

| RD2-score01-2=4

| RD2-score01-3=

| RD2-seed02=

| RD2-team02={{flagicon|ESP}} C Alcaraz

| RD2-score02-1=6

| RD2-score02-2=6

| RD2-score02-3=

| RD2-seed03=

| RD2-team03={{flagicon|GEO}} N Basilashvili

| RD2-score03-1=77

| RD2-score03-2=2

| RD2-score03-3=3

| RD2-seed04=3

| RD2-team04={{flagicon|ITA}} M Berrettini

| RD2-score04-1=65

| RD2-score04-2=6

| RD2-score04-3=6

| RD2-seed05=6

| RD2-team05={{flagicon|CAN}} F Auger-Aliassime

| RD2-score05-1=2

| RD2-score05-2=78

| RD2-score05-3=6

| RD2-seed06=

| RD2-team06={{flagicon|GBR}} C Norrie

| RD2-score06-1=6

| RD2-score06-2=66

| RD2-score06-3=4

| RD2-seed07=

| RD2-team07={{flagicon|AUS}} A de Minaur

| RD2-score07-1=2

| RD2-score07-2=6

| RD2-score07-3=2

| RD2-seed08=2

| RD2-team08={{flagicon|GER}} A Zverev

| RD2-score08-1=6

| RD2-score08-2=3

| RD2-score08-3=6

| RD3-seed01=

| RD3-team01={{flagicon|ESP}} C Alcaraz

| RD3-score01-1=6

| RD3-score01-2=62

| RD3-score01-3=77

| RD3-seed02=3

| RD3-team02={{flagicon|ITA}} M Berrettini

| RD3-score02-1=1

| RD3-score02-2=77

| RD3-score02-3=65

| RD3-seed03=6

| RD3-team03={{flagicon|CAN}} F Auger-Aliassime

| RD3-score03-1=4

| RD3-score03-2=6

| RD3-score03-3=3

| RD3-seed04=2

| RD3-team04={{flagicon|GER}} A Zverev

| RD3-score04-1=6

| RD3-score04-2=3

| RD3-score04-3=6

| RD4-seed01=

| RD4-team01={{flagicon|ESP}} C Alcaraz

| RD4-score01-1=3

| RD4-score01-2=3

| RD4-score01-3=

| RD4-seed02=2

| RD4-team02={{flagicon|GER}} A Zverev

| RD4-score02-1=6

| RD4-score02-2=6

| RD4-score02-3=

}}

Qualifying

=Seeds=

{{columns-list|colwidth=30em|

  1. {{flagicon|USA}} Frances Tiafoe (qualified)
  2. {{flagicon|USA}} Marcos Giron (first round)
  3. {{flagicon|RSA}} Kevin Anderson (qualified)
  4. {{flagicon|GER}} Dominik Koepfer (qualifying competition, lucky loser)
  5. {{flagicon|ITA}} Gianluca Mager (qualified)
  6. {{flagicon|AUS}} Alexei Popyrin (qualified)
  7. {{flagicon|ESP}} Roberto Carballés Baena (qualifying competition)
  8. {{flagicon|GER}} Peter Gojowczyk (first round)

}}

=Qualifiers=

{{columns-list|colwidth=30em|

  1. {{flagicon|USA}} Frances Tiafoe
  2. {{flagicon|AUS}} Alexei Popyrin
  3. {{flagicon|RSA}} Kevin Anderson
  4. {{flagicon|ITA}} Gianluca Mager

}}

=Lucky loser=

{{columns-list|colwidth=30em|

  1. {{flagicon|GER}} Dominik Koepfer

}}

=Qualifying draw=

==First qualifier==

{{4TeamBracket-Tennis3-v2

| RD1=First round

| RD2=Qualifying competition

|team-width=175

| RD1-seed1=1

| RD1-team1={{flagicon|USA}} Frances Tiafoe

| RD1-score1-1=6

| RD1-score1-2=3

| RD1-score1-3=6

| RD1-seed2=

| RD1-team2={{flagicon|SVK}} Alex Molčan

| RD1-score2-1=4

| RD1-score2-2=6

| RD1-score2-3=1

| RD1-seed3=WC

| RD1-team3={{flagicon|AUT}} Lucas Miedler

| RD1-score3-1=77

| RD1-score3-2=6

| RD1-score3-3=

| RD1-seed4=8

| RD1-team4={{flagicon|GER}} Peter Gojowczyk

| RD1-score4-1=64

| RD1-score4-2=2

| RD1-score4-3=

| RD2-seed1=1

| RD2-team1={{flagicon|USA}} Frances Tiafoe

| RD2-score1-1=65

| RD2-score1-2=6

| RD2-score1-3=6

| RD2-seed2=WC

| RD2-team2={{flagicon|AUT}} Lucas Miedler

| RD2-score2-1=77

| RD2-score2-2=4

| RD2-score2-3=3

}}

==Second qualifier==

{{4TeamBracket-Tennis3-v2

| RD1=First round

| RD2=Qualifying competition

|team-width=175

| RD1-seed1=2

| RD1-team1={{flagicon|USA}} Marcos Giron

| RD1-score1-1=65

| RD1-score1-2=4

| RD1-score1-3=

| RD1-seed2=

| RD1-team2={{flagicon|SVK}} Norbert Gombos

| RD1-score2-1=77

| RD1-score2-2=6

| RD1-score2-3=

| RD1-seed3=

| RD1-team3={{flagicon|ESP}} Feliciano López

| RD1-score3-1=5

| RD1-score3-2=68

| RD1-score3-3=

| RD1-seed4=6

| RD1-team4={{flagicon|AUS}} Alexei Popyrin

| RD1-score4-1=7

| RD1-score4-2=710

| RD1-score4-3=

| RD2-seed1=

| RD2-team1={{flagicon|SVK}} Norbert Gombos

| RD2-score1-1=63

| RD2-score1-2=77

| RD2-score1-3=5

| RD2-seed2=6

| RD2-team2={{flagicon|AUS}} Alexei Popyrin

| RD2-score2-1=77

| RD2-score2-2=60

| RD2-score2-3=7

}}

==Third qualifier==

{{4TeamBracket-Tennis3-v2

| RD1=First round

| RD2=Qualifying competition

|team-width=175

| RD1-seed1=3

| RD1-team1={{flagicon|RSA}} Kevin Anderson

| RD1-score1-1=6

| RD1-score1-2=6

| RD1-score1-3=

| RD1-seed2=Alt

| RD1-team2={{flagicon|AUT}} Jurij Rodionov

| RD1-score2-1=1

| RD1-score2-2=4

| RD1-score2-3=

| RD1-seed3=WC

| RD1-team3={{flagicon|SUI}} Dominic Stricker

| RD1-score3-1=4

| RD1-score3-2=6

| RD1-score3-3=1

| RD1-seed4=7

| RD1-team4={{flagicon|ESP}} Roberto Carballés Baena

| RD1-score4-1=6

| RD1-score4-2=3

| RD1-score4-3=6

| RD2-seed1=3

| RD2-team1={{flagicon|RSA}} Kevin Anderson

| RD2-score1-1=7

| RD2-score1-2=4

| RD2-score1-3=77

| RD2-seed2=7

| RD2-team2={{flagicon|ESP}} Roberto Carballés Baena

| RD2-score2-1=5

| RD2-score2-2=6

| RD2-score2-3=65

}}

==Fourth qualifier==

{{4TeamBracket-Tennis3-v2

| RD1=First round

| RD2=Qualifying competition

|team-width=175

| RD1-seed1=4

| RD1-team1={{flagicon|GER}} Dominik Koepfer

| RD1-score1-1=78

| RD1-score1-2=6

| RD1-score1-3=

| RD1-seed2=Alt

| RD1-team2={{flagicon|AUS}} Alex Bolt

| RD1-score2-1=66

| RD1-score2-2=1

| RD1-score2-3=

| RD1-seed3=WC

| RD1-team3={{flagicon|AUT}} Alexander Erler

| RD1-score3-1=77

| RD1-score3-2=2

| RD1-score3-3=4

| RD1-seed4=5

| RD1-team4={{flagicon|ITA}} Gianluca Mager

| RD1-score4-1=62

| RD1-score4-2=6

| RD1-score4-3=6

| RD2-seed1=4

| RD2-team1={{flagicon|GER}} Dominik Koepfer

| RD2-score1-1=3

| RD2-score1-2=6

| RD2-score1-3=3

| RD2-seed2=5

| RD2-team2={{flagicon|ITA}} Gianluca Mager

| RD2-score2-1=6

| RD2-score2-2=3

| RD2-score2-3=6

}}

References

{{reflist}}