2021 Generali Open Kitzbühel
The 2021 Generali Open Kitzbühel is a tennis tournament played on outdoor clay courts. It is the 77th edition of the Austrian Open Kitzbühel, and part of the World Tour 250 series of the 2021 ATP Tour. It will take place at the Tennis stadium Kitzbühel in Kitzbühel, Austria, from 24 through 31 July 2021.
Champions
Singles
Casper Ruud def. Pedro Martínez, 6–1, 4–6, 6–3.Doubles
Alexander Erler / Lucas Miedler def. Roman Jebavý / Matwé Middelkoop, 7–5, 7–6Points and prize money
Prize money
| Event | W | F | SF | QF | Round of 16 | Round of 32 | Q2 | Q1 |
| Singles | €41,145 | €29,500 | €21,000 | €14,000 | €9,000 | €5,415 | €2,645 | €1,375 |
| Doubles* | €15,360 | €11,000 | €7,250 | €4,710 | €2,760 |
*per team
Singles main draw entrants
Seeds
1 Rankings as of July 19, 2021.Other entrants
The following players received wildcards into the singles main draw:The following player received entry as an alternate:
The following player received entry as a special exempt:
The following players received entry from the qualifying draw:
The following players received entry as lucky losers:
Withdrawals
;Before the tournament- Aljaž Bedene → replaced by Carlos Taberner
- Richard Gasquet → replaced by Mario Vilella Martínez
- Dušan Lajović → replaced by Arthur Rinderknech
- Corentin Moutet → replaced by Mikael Ymer
- Lorenzo Musetti → replaced by Radu Albot
- Jo-Wilfried Tsonga → replaced by Lucas Pouille
Doubles main draw entrants
Seeds
1 Rankings as of July 19, 2021.Other entrants
The following pairs received wildcards into the doubles main draw:The following pair received entry using a protected ranking:
Withdrawals
;Before the tournament- Sander Arends / David Pel → replaced by David Pel / Arthur Rinderknech
- Ariel Behar / Gonzalo Escobar → replaced by Ariel Behar / Guillermo Durán
- Pablo Cuevas / Fabrice Martin → replaced by Pablo Cuevas / Thiago Seyboth Wild