# 2021 Porsche Tennis Grand Prix – Singles

Ashleigh Barty defeated Aryna Sabalenka in the final, 3–6, 6–0, 6–3 to win the women's singles tennis title at the 2021 Stuttgart Open. It marked her 11th career Women's Tennis Association (WTA) singles title and her second on clay. She became the first reigning world No. 1 to win the title since Justine Henin in 2007.
Petra Kvitová was the defending champion from when the tournament was last held in 2019, but lost in the quarterfinals to Elina Svitolina.

## Seeds

The top four seeds received a bye into the second round.
* Ashleigh Barty (champion)
* Simona Halep (semifinals)
* Sofia Kenin (second round)
* Elina Svitolina (semifinals)
* Aryna Sabalenka (final)
* Karolína Plíšková (quarterfinals)
* Petra Kvitová (quarterfinals)
* Belinda Bencic (second 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 | Ashleigh Barty | 4 | 7$^7$ | 6 | | | | | |
| 4 | Elina Svitolina | 6 | 6$^5$ | 2 | | | | | |
| 4 | Elina Svitolina | 6 | 6$^5$ | 2 | 1 | Ashleigh Barty | 3 | 6 | 6 |
| | | | | | 5 | Aryna Sabalenka | 6 | 0 | 3 |
| 5 | Aryna Sabalenka | 6 | 6 | | 5 | Aryna Sabalenka | 6 | 0 | 3 |
| 2 | Simona Halep | 3 | 2 | | | | | | |

### 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 | Semifinals |
| | | | | | 1 | A Barty | 6 | 7 | | | | | | | | | | | |
| | L Siegemund | 6 | 3 | 6 | | L Siegemund | 0 | 5 | | | | | | | | | | | |
| Q | M Barthel | 4 | 6 | 1 | | | | | | 1 | A Barty | 2 | 6 | 7 | | | | | |
| | J Ostapenko | 6 | 7 | | | | | | | 6 | Ka Plíšková | 6 | 1 | 5 | | | | | |
| Q | S Vögele | 4 | 5 | | | J Ostapenko | 7$^9$ | 4 | 3 | | | | | | | | | | |
| LL | T Korpatsch | 5 | 6 | 3 | 6 | Ka Plíšková | 6$^7$ | 6 | 6 | | | | | | | | | | |
| 6 | Ka Plíšková | 7 | 3 | 6 | | | | | | | | | | | 1 | A Barty | 4 | 7$^7$ | 6 |
| | | | | | | | | | | | | | | | 4 | E Svitolina | 6 | 6$^5$ | 2 |
| | | | | | 4 | E Svitolina | 7$^7$ | 6 | | | | | | | | | | | |
| | A Kerber | 6 | 6 | | | A Kerber | 6$^4$ | 3 | | | | | | | | | | | |
| LL | E Gorgodze | 2 | 2 | | | | | | | 4 | E Svitolina | 6$^4$ | 7 | 6 | | | | | |
| | M Sakkari | 6 | 6 | | | | | | | 7 | P Kvitová | 7$^7$ | 5 | 2 | | | | | |
| WC | A Petkovic | 2 | 2 | | | M Sakkari | 3 | 6 | 3 | | | | | | | | | | |
| | J Brady | 4 | 3 | | 7 | P Kvitová | 6 | 3 | 6 | | | | | | | | | | |
| 7 | P Kvitová | 6 | 6 | | | | | | | | | | | | | | | | |

### Bottom half

| First round | First round | First round | First round | First round | Second round | Second round | Second round | Second round | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Quarterfinals | Semifinals | Semifinals | Semifinals | Semifinals |
| 5 | A Sabalenka | 6 | 6 | | | | | | | | | | | | | | |
| | S Zhang | 2 | 2 | | 5 | A Sabalenka | 6 | 6 | | | | | | | | | |
| Q | U Eikeri | 2 | 0 | | Q | A-L Friedsam | 4 | 2 | | | | | | | | | |
| Q | A-L Friedsam | 6 | 6 | | | | | | 5 | A Sabalenka | 7 | 4 | 6 | | | | |
| Q | J Middendorf | 2 | 3 | | | | | | | A Kontaveit | 5 | 6 | 1 | | | | |
| | A Kontaveit | 6 | 6 | | | A Kontaveit | 7 | 6 | | | | | | | | | |
| | | | | | 3 | S Kenin | 5 | 4 | | | | | | | | | |
| | | | | | | | | | | | | | | 5 | A Sabalenka | 6 | 6 |
| 8 | B Bencic | 6 | 6 | | | | | | | | | | | 2 | S Halep | 3 | 2 |
| Q | N Schunk | 4 | 2 | | 8 | B Bencic | 1 | 5 | | | | | | | | | |
| | E Alexandrova | 4 | 6 | 6 | | E Alexandrova | 6 | 7 | | | | | | | | | |
| | K Muchová | 6 | 2 | 3 | | | | | | E Alexandrova | 1 | 4 | | | | | |
| | M Bouzková | 1 | 6$^6$ | | | | | | 2 | S Halep | 6 | 6 | | | | | |
| | M Vondroušová | 6 | 7$^8$ | | | M Vondroušová | 1 | 3 | | | | | | | | | |
| | | | | | 2 | S Halep | 6 | 6 | | | | | | | | | |

## Qualifying
### Seeds

* Margarita Gasparyan (first round)
* Varvara Gracheva (qualifying competition)
* Wang Yafan (withdrew)
* Anna-Lena Friedsam (qualified)
* Stefanie Vögele (qualified)
* Tamara Korpatsch (qualifying competition, lucky loser)
* Mona Barthel (qualified)
* Daniela Seguel (first round)
* Jana Fett (first round)
* Indy de Vroome (first round)
* Antonia Lottner (first round)
* Laura Ioana Paar (first round)

### Qualifiers

* Nastasja Schunk
* Mona Barthel
* Ulrikke Eikeri
* Anna-Lena Friedsam
* Stefanie Vögele
* Julia Middendorf

### Lucky losers

* Tamara Korpatsch
* Ekaterine Gorgodze

### Qualifying draw
#### First qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 1 | Margarita Gasparyan | 3 | 4 | | | | |
| WC | Noma Noha Akugue | 6 | 6 | | | | |
| WC | Noma Noha Akugue | 6 | 6 | WC | Noma Noha Akugue | 0 | 4 |
| | | | | WC | Nastasja Schunk | 6 | 6 |
| WC | Nastasja Schunk | 6 | 6 | WC | Nastasja Schunk | 6 | 6 |
| 8 | Daniela Seguel | 4 | 4 | | | | |

#### Second qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 2 | Varvara Gracheva | 6 | 7 | | | | | |
| | Bethanie Mattek-Sands | 2 | 5 | | | | | |
| | Bethanie Mattek-Sands | 2 | 5 | 2 | Varvara Gracheva | 2 | 6 | 3 |
| | | | | 7 | Mona Barthel | 6 | 3 | 6 |
| | Martina Caregaro | 1 | 4 | 7 | Mona Barthel | 6 | 3 | 6 |
| 7 | Mona Barthel | 6 | 6 | | | | | |

#### Third qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| Alt | Angelica Moratelli | 6 | 7 | | | | | |
| | Tena Lukas | 0 | 5 | | | | | |
| | Tena Lukas | 0 | 5 | | Alt | Angelica Moratelli | 3 | 4 |
| | | | | | | Ulrikke Eikeri | 6 | 6 |
| | Ulrikke Eikeri | 3 | 6 | 6 | | Ulrikke Eikeri | 6 | 6 |
| 11 | Antonia Lottner | 6 | 3 | 3 | | | | |

#### Fourth qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 4 | Anna-Lena Friedsam | 6 | 4 | 6 | | | | |
| | Stephanie Wagner | 4 | 6 | 3 | | | | |
| | Stephanie Wagner | 4 | 6 | 3 | 4 | Anna-Lena Friedsam | 6 | 6 |
| | | | | | | Ekaterine Gorgodze | 3 | 1 |
| | Ekaterine Gorgodze | 6 | 6 | | | Ekaterine Gorgodze | 3 | 1 |
| 10 | Indy de Vroome | 2 | 2 | | | | | |

#### Fifth qualifier

| First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 5 | Stefanie Vögele | 6 | 6 | | | | |
| PR | Anna Zaja | 1 | 3 | | | | |
| PR | Anna Zaja | 1 | 3 | 5 | Stefanie Vögele | 6 | 6 |
| | | | | | Katharina Gerlach | 3 | 1 |
| | Katharina Gerlach | 6 | 7 | | Katharina Gerlach | 3 | 1 |
| 12 | Laura Ioana Paar | 3 | 5 | | | | |

#### Sixth qualifier

| First round | First round | First round | First round | First round | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition | Qualifying competition |
| 6 | Tamara Korpatsch | 2 | 6 | 6 | | | | | |
| WC | Alexandra Vecic | 6 | 4 | 2 | | | | | |
| WC | Alexandra Vecic | 6 | 4 | 2 | 6 | Tamara Korpatsch | 6 | 3 | 0 |
| | | | | | WC | Julia Middendorf | 2 | 6 | 6 |
| WC | Julia Middendorf | 4 | 6 | 6 | WC | Julia Middendorf | 2 | 6 | 6 |
| 9 | Jana Fett | 6 | 1 | 3 | | | | | |

## Sources

* Main draw
* Qualifying draw