# 2021 Upper Austria Ladies Linz – Singles

Alison Riske won the title, defeating Jaqueline Cristian in the final, 2–6, 6–2, 7–5.
Aryna Sabalenka was the defending champion, but she qualified to compete at the WTA Finals instead.

## Seeds

The top four seeds received a bye into the second round.
* Emma Raducanu (second round)
* Simona Halep (semifinals, withdrew)
* Danielle Collins (semifinals, retired due to shoulder injury)
* Veronika Kudermetova (quarterfinals)
* Ekaterina Alexandrova (first round)
* Sorana Cîrstea (withdrew)
* Jasmine Paolini (quarterfinals)
* Alison Riske (champion)

## 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 | Final | Final | Final | Final | Final |
| 8 | Alison Riske | 7 | 0 | | | | | |
| 3 | Danielle Collins | 5 | 0$^r$ | | | | | |
| 3 | Danielle Collins | 5 | 0$^r$ | 8 | Alison Riske | 2 | 6 | 7 |
| | | | | LL | Jaqueline Cristian | 6 | 2 | 5 |
| LL | Jaqueline Cristian | w/o | | LL | Jaqueline Cristian | 6 | 2 | 5 |
| 2/WC | Simona Halep | | | | | | | |

### 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 | Semifinals | Semifinals | Semifinals | Semifinals |
| | | | | | 1/WC | E Raducanu | 1 | 7$^7$ | 5 | | | | | | | | |
| Q | K Kozlova | 6 | 2 | 3 | Q | Xin Wang | 6 | 6$^0$ | 7 | | | | | | | | |
| Q | Xin Wang | 2 | 6 | 6 | | | | | | Q | Xin Wang | 3 | 5 | | | | |
| | A Cornet | 7$^9$ | 6 | | | | | | | 8 | A Riske | 6 | 7 | | | | |
| WC | J Grabher | 6$^7$ | 4 | | | A Cornet | 4 | 4 | | | | | | | | | |
| PR | M Barthel | 3 | 1 | | 8 | A Riske | 6 | 6 | | | | | | | | | |
| 8 | A Riske | 6 | 6 | | | | | | | | | | | 8 | A Riske | 7 | 0 |
| | | | | | | | | | | | | | | 3 | D Collins | 5 | 0$^r$ |
| | | | | | 3 | D Collins | 6 | 6 | | | | | | | | | |
| | G Minnen | 6 | 6 | | | G Minnen | 1 | 2 | | | | | | | | | |
| | O Dodin | 4 | 3 | | | | | | | 3 | D Collins | 7 | 6 | | | | |
| | A Van Uytvanck | 6 | 6 | | | | | | | | A Van Uytvanck | 5 | 3 | | | | |
| WC | S Kraus | 1 | 0 | | | A Van Uytvanck | 6 | 6 | | | | | | | | | |
| Q | L Tsurenko | 6 | 7$^7$ | | Q | L Tsurenko | 0 | 3 | | | | | | | | | |
| 5 | E Alexandrova | 4 | 6$^2$ | | | | | | | | | | | | | | |

### 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 |
| LL | J Cristian | 2 | 6 | 7 | | | | | | | | | | | | | |
| | K Rakhimova | 6 | 2 | 5 | LL | J Cristian | 5 | | | | | | | | | | |
| Q | H Tan | 2 | 4 | | | R Peterson | 2$^r$ | | | | | | | | | | |
| | R Peterson | 6 | 6 | | | | | | | LL | J Cristian | 6 | 7$^7$ | | | | |
| | A Kalinina | 6 | 6 | | | | | | | 4 | V Kudermetova | 2 | 6$^5$ | | | | |
| | M Trevisan | 3 | 4 | | | A Kalinina | 6 | 4 | 2 | | | | | | | | |
| | | | | | 4 | V Kudermetova | 4 | 6 | 6 | | | | | | | | |
| | | | | | | | | | | | | | | | LL | J Cristian | w/o |
| 7 | J Paolini | 6 | 3 | 6 | | | | | | | | | | | 2/WC | S Halep | |
| | D Yastremska | 4 | 6 | 2 | 7 | J Paolini | 6 | 2 | 6 | | | | | | | | |
| | C Burel | 4 | 1 | | | S Zheng | 1 | 6 | 4 | | | | | | | | |
| | S Zheng | 6 | 6 | | | | | | | 7 | J Paolini | 6 | 5 | 0 | | | |
| | F Ferro | 2 | 6 | 2 | | | | | | 2/WC | S Halep | 4 | 7 | 6 | | | |
| | A Sasnovich | 6 | 3 | 6 | | A Sasnovich | 5 | 3 | | | | | | | | | |
| | | | | | 2/WC | S Halep | 7 | 6 | | | | | | | | | |

## Qualifying
### Seeds

* Jaqueline Cristian (qualifying competition, lucky loser)
* Wang Xinyu (qualified)
* Ana Bogdan (qualifying competition)
* Harmony Tan (qualified)
* Kristína Kučová (qualifying competition)
* Viktoriya Tomova (first round)
* Lesia Tsurenko (qualified)
* Kamilla Rakhimova (moved to main draw)

### Qualifiers

* Lesia Tsurenko
* Wang Xinyu
* Kateryna Kozlova
* Harmony Tan

### Lucky loser

* Jaqueline Cristian

#### First qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 1 | Jaqueline Cristian | 6 | 6 | | | | | |
| PR | Irina Khromacheva | 3 | 2 | | | | | |
| PR | Irina Khromacheva | 3 | 2 | 1 | Jaqueline Cristian | 7 | 4 | 1 |
| | | | | 7 | Lesia Tsurenko | 5 | 6 | 6 |
| PR | Mandy Minella | 2 | 1 | 7 | Lesia Tsurenko | 5 | 6 | 6 |
| 7 | Lesia Tsurenko | 6 | 6 | | | | | |

#### Second qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 2 | Wang Xinyu | 6 | 6 | | | | | |
| | Anastasia Gasanova | 2 | 2 | | | | | |
| | Anastasia Gasanova | 2 | 2 | 2 | Wang Xinyu | 4 | 6 | 6 |
| | | | | Alt | Leonie Küng | 6 | 2 | 3 |
| WC | Mavie Österreicher | 5 | 6$^1$ | Alt | Leonie Küng | 6 | 2 | 3 |
| Alt | Leonie Küng | 7 | 7$^7$ | | | | | |

#### Third qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 3 | Ana Bogdan | 6 | 4 | 7$^7$ | | | | |
| WC | Eva Lys | 4 | 6 | 6$^4$ | | | | |
| WC | Eva Lys | 4 | 6 | 6$^4$ | 3 | Ana Bogdan | 6$^2$ | 4 |
| | | | | | PR | Kateryna Kozlova | 7$^7$ | 6 |
| PR | Kateryna Kozlova | 6 | 2 | 6 | PR | Kateryna Kozlova | 7$^7$ | 6 |
| 6 | Viktoriya Tomova | 1 | 6 | 2 | | | | |

#### Fourth qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 4 | Harmony Tan | 6 | 6 | | | | | | |
| | Aleksandra Krunić | 4 | 1 | | | | | | |
| | Aleksandra Krunić | 4 | 1 | | 4 | Harmony Tan | 5 | 6 | 6 |
| | | | | | 5 | Kristína Kučová | 7 | 3 | 4 |
| | Mihaela Buzărnescu | 2 | 7$^7$ | 3 | 5 | Kristína Kučová | 7 | 3 | 4 |
| 5 | Kristína Kučová | 6 | 6$^4$ | 6 | | | | | |