2021 Erste Bank Open
Tennis tournament
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The 2021 Erste Bank Open was a men's tennis tournament played on indoor hard courts. It was the 47th edition of the event, and part of the ATP Tour 500 Series of the 2021 ATP Tour. It was held at the Wiener Stadthalle in Vienna, Austria, from 25 until 31 October 2021. Second-seeded Alexander Zverev won the singles title.[3]
| 2021 Erste Bank Open | |
|---|---|
| Date | 25–31 October |
| Edition | 47th |
| Category | ATP Tour 500 Series |
| Draw | 32S / 16D |
| Prize money | €1,952,015 |
| Surface | Hard (indoor) |
| Location | Vienna, Austria |
| Venue | Wiener Stadthalle |
| Champions | |
| Singles | |
 Alexander Zverev[1] | |
| Doubles | |
 Juan Sebastián Cabal / Robert Farah[2] | |
Finals
Singles
Alexander Zverev def. 
Frances Tiafoe, 7–5, 6–4
Doubles
Juan Sebastián Cabal / Robert Farah def. Rajeev Ram / 
Joe Salisbury, 6–4, 6–2
Singles main-draw entrants
Seeds
| Country | Player | Rank1 | Seed |
|---|---|---|---|
 GRE |
Stefanos Tsitsipas | 3 | 1 |
| GER |
Alexander Zverev | 4 | 2 |
 ITA |
Matteo Berrettini | 7 | 3 |
 NOR |
Casper Ruud | 9 | 4 |
 POL |
Hubert Hurkacz | 10 | 5 |
 CAN |
Félix Auger-Aliassime | 12 | 6 |
| ITA |
Jannik Sinner | 13 | 7 |
 ARG |
Diego Schwartzman | 14 | 8 |
- Rankings are as of October 18, 2021[4]
Other entrants
The following players received wildcards into the singles main draw:
The following player received entry using a special exempt:
The following players received entry from the qualifying draw:
The following player received entry as a lucky loser:
Withdrawals
- Before the tournament
Cristian Garín → replaced by Dominik Koepfer
Ugo Humbert → replaced by 
Márton Fucsovics
Doubles main-draw entrants
Seeds
| Country | Player | Country | Player | Rank1 | Seed |
|---|---|---|---|---|---|
 CRO |
Nikola Mektić | CRO |
Mate Pavić | 3 | 1 |
 USA |
Rajeev Ram |  GBR |
Joe Salisbury | 7 | 2 |
 AUS |
John Peers |  SVK |
Filip Polášek | 22 | 3 |
| COL |
Juan Sebastián Cabal | COL |
Robert Farah | 27 | 4 |
- Rankings are as of 18 October 2021
Other entrants
The following pairs received wildcards into the doubles main draw:
The following pair received entry from the qualifying draw:
The following pair received entry as lucky losers:
Withdrawals
- Before the tournament
- Cristian Garín / Cameron Norrie → replaced by
Sander Gillé / Dominik Koepfer - Kevin Krawietz /
Horia Tecău → replaced by 
Lloyd Harris / Horia Tecău
