2021 Erste Bank Open
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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.
Finals
Singles
- Germany Alexander Zverev def. United States Frances Tiafoe, 7–5, 6–4
Doubles
- Colombia Juan Sebastián Cabal / Colombia Robert Farah def. United States Rajeev Ram / United Kingdom 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
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
- Chile Cristian Garín → replaced by Germany Dominik Koepfer
- France Ugo Humbert → replaced by Hungary 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
- Chile Cristian Garín / United Kingdom Cameron Norrie → replaced by Belgium Sander Gillé / Germany Dominik Koepfer
- Germany Kevin Krawietz / Romania Horia Tecău → replaced by South Africa Lloyd Harris / Romania Horia Tecău