# 2021 Generali Open Kitzbühel – Singles

Miomir Kecmanović was the defending champion, but chose to compete at the Summer Olympics instead.
Casper Ruud won his fifth ATP Tour title, defeating Pedro Martínez in the final, 6–1, 4–6, 6–3. It was Ruud's third consecutive title in as many weeks.

## Seeds

The top four seeds receive a bye into the second round.
* Casper Ruud (champion)
* Roberto Bautista Agut (second round)
* Filip Krajinović (quarterfinals)
* Albert Ramos Viñolas (second round)
* Federico Delbonis (first round)
* Laslo Đere (first round)
* Aljaž Bedene (withdrew)
* Richard Gasquet (withdrew)
* Jaume Munar (first round)
* Carlos Alcaraz (first round)

## Draw
### Key

* Q = Qualifier
* WC = Wild card
* LL = Lucky loser
* Alt = Alternate
* SE = Special exempt
* PR = Protected ranking
* ITF = ITF entry
* JE = Junior exempt
* w/o = Walkover
* r = Retired
* d = Defaulted
* SR = Special ranking

### Finals

| Semifinals | Semifinals | Semifinals | Semifinals | Semifinals | Final | Final | Final | Final | Final |
| 1 | Casper Ruud | 6 | 7$^9$ | | | | | | |
| Alt | Arthur Rinderknech | 3 | 6$^7$ | | | | | | |
| Alt | Arthur Rinderknech | 3 | 6$^7$ | | 1 | Casper Ruud | 6 | 4 | 6 |
| | | | | | | Pedro Martínez | 1 | 6 | 3 |
| SE | Daniel Altmaier | 6 | 3 | 3 | | Pedro Martínez | 1 | 6 | 3 |
| | Pedro Martínez | 4 | 6 | 6 | | | | | |

### Top half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| | | | | | 1 | C Ruud | 7 | 5 | 6 | | | | | | | | | |
| LL | M Vilella Martínez | 6$^4$ | 7 | 6 | LL | M Vilella Martínez | 5 | 7 | 4 | | | | | | | | | |
| Q | L Neumayer | 7$^7$ | 5 | 4 | | | | | | 1 | C Ruud | 3 | 7$^7$ | 6 | | | | |
| | P Cuevas | 3 | 5 | | | | | | | | M Ymer | 6 | 6$^5$ | 1 | | | | |
| | M Ymer | 6 | 7 | | | M Ymer | 6 | 6 | | | | | | | | | | |
| WC | A Erler | 7 | 1 | 6 | WC | A Erler | 2 | 3 | | | | | | | | | | |
| 10 | C Alcaraz | 5 | 6 | 2 | | | | | | | | | | | 1 | C Ruud | 6 | 7$^9$ |
| | | | | | | | | | | | | | | | Alt | A Rinderknech | 3 | 6$^7$ |
| | | | | | 3 | F Krajinović | 6 | 2 | 6 | | | | | | | | | |
| WC | T Seyboth Wild | 6 | 3 | 2 | LL | C Taberner | 3 | 6 | 4 | | | | | | | | | |
| LL | C Taberner | 3 | 6 | 6 | | | | | | 3 | F Krajinović | 4 | 1 | | | | | |
| | S Travaglia | 3 | 4 | | | | | | | Alt | A Rinderknech | 6 | 6 | | | | | |
| Q | H Rune | 6 | 6 | | Q | H Rune | 4 | 6 | 6$^4$ | | | | | | | | | |
| Alt | A Rinderknech | 6 | 6 | | Alt | A Rinderknech | 6 | 3 | 7$^7$ | | | | | | | | | |
| 5 | F Delbonis | 2 | 4 | | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 6 | L Đere | 6 | 3 | 3 | | | | | | | | | | | | | | | |
| SE | D Altmaier | 4 | 6 | 6 | SE | D Altmaier | 6 | 6 | | | | | | | | | | | |
| | R Albot | 3 | 6$^7$ | | | M Cecchinato | 4 | 4 | | | | | | | | | | | |
| | M Cecchinato | 6 | 7$^9$ | | | | | | | SE | D Altmaier | 6 | 6$^5$ | 6 | | | | | |
| | G Mager | 6 | 6 | | | | | | | | G Mager | 1 | 7$^7$ | 3 | | | | | |
| WC | D Novak | 4 | 0 | | | G Mager | 7$^7$ | 1 | 7 | | | | | | | | | | |
| | | | | | 4 | A Ramos Viñolas | 6$^3$ | 6 | 5 | | | | | | | | | | |
| | | | | | | | | | | | | | | | SE | D Altmaier | 6 | 3 | 3 |
| 9 | J Munar | 4 | 4 | | | | | | | | | | | | | P Martínez | 4 | 6 | 6 |
| Q | J Kovalík | 6 | 6 | | Q | J Kovalík | 2 | 6 | 6 | | | | | | | | | | |
| | J Veselý | 6 | 6 | | | J Veselý | 6 | 2 | 4 | | | | | | | | | | |
| Q | E Gulbis | 4 | 1 | | | | | | | Q | J Kovalík | 2 | 2 | | | | | | |
| | L Pouille | 3 | 7$^7$ | 4 | | | | | | | P Martínez | 6 | 6 | | | | | | |
| | P Martínez | 6 | 6$^4$ | 6 | | P Martínez | 6 | 6$^5$ | 7 | | | | | | | | | | |
| | | | | | 2 | R Bautista Agut | 4 | 7$^7$ | 5 | | | | | | | | | | |

## Qualifying
### Seeds

* Carlos Taberner (qualifying competition, lucky loser)
* Andrej Martin (qualifying competition)
* Jozef Kovalík (qualified)
* Juan Ignacio Londero (first round, retired)
* Juan Manuel Cerúndolo (first round)
* Marc Polmans (first round)
* Nikola Milojević (first round)
* Mario Vilella Martínez (qualifying competition, lucky loser)

### Qualifiers

* Ernests Gulbis
* Holger Rune
* Jozef Kovalík
* Lukas Neumayer

### Lucky losers

* Carlos Taberner
* Mario Vilella Martínez

### Qualifying draw
#### First qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 1 | Carlos Taberner | 6 | 7$^7$ | | | | | |
| | Evgeny Karlovskiy | 4 | 6$^4$ | | | | | |
| | Evgeny Karlovskiy | 4 | 6$^4$ | 1 | Carlos Taberner | 3 | 6 | 3 |
| | | | | | Ernests Gulbis | 6 | 3 | 6 |
| | Ernests Gulbis | 6 | 6 | | Ernests Gulbis | 6 | 3 | 6 |
| 7 | Nikola Milojević | 3 | 4 | | | | | |

#### Second qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 2 | Andrej Martin | 6 | 6 | | | | |
| | Zizou Bergs | 4 | 3 | | | | |
| | Zizou Bergs | 4 | 3 | 2 | Andrej Martin | 5 | 5 |
| | | | | | Holger Rune | 7 | 7 |
| | Holger Rune | 7$^8$ | 6 | | Holger Rune | 7 | 7 |
| 6 | Marc Polmans | 6$^6$ | 3 | | | | |

#### Third qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 3 | Jozef Kovalík | 6 | 6 | | | | |
| WC | Leandro Riedi | 2 | 4 | | | | |
| WC | Leandro Riedi | 2 | 4 | 3 | Jozef Kovalík | 7 | 7 |
| | | | | 8 | Mario Vilella Martínez | 5 | 5 |
| Alt | Lucas Miedler | 3 | 4 | 8 | Mario Vilella Martínez | 5 | 5 |
| 8 | Mario Vilella Martínez | 6 | 6 | | | | |

#### Fourth qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 4 | Juan Ignacio Londero | 6$^7$ | 0$^r$ | | | | | |
| WC | Lukas Neumayer | 7$^9$ | 0 | | | | | |
| WC | Lukas Neumayer | 7$^9$ | 0 | | WC | Lukas Neumayer | 6 | 7$^7$ |
| | | | | | | Lukáš Rosol | 4 | 6$^5$ |
| | Lukáš Rosol | 6 | 6$^{10}$ | 6 | | Lukáš Rosol | 4 | 6$^5$ |
| 5 | Juan Manuel Cerúndolo | 3 | 7$^{12}$ | 1 | | | | |