The 2021 Porsche Tennis Grand Prix was a women's tennis tournament played on indoor clay courts. It was the 43rd edition of the Porsche Tennis Grand Prix and was classified as a WTA 500 tournament on the 2021 WTA Tour. It was held at the Porsche Arena in Stuttgart, Germany from 19 to 25 April 2021.[1]
Ashleigh Barty won both the singles title and doubles title (alongside partner Jennifer Brady). The feat earned Barty her 11th career WTA Tour singles title and made her the first reigning world No. 1 to win the singles tournament since Justine Henin in 2007. By winning her 12th career WTA Tour doubles title, she also became the first player to sweep both tournaments since Lindsay Davenport in 2001. It was Brady's maiden career WTA Tour doubles title.[2]
See main article: 2021 Porsche Tennis Grand Prix – Singles.
Ashleigh Barty defeated 
Aryna Sabalenka, 3–6, 6–0, 6–3.See main article: 2021 Porsche Tennis Grand Prix – Doubles.
Ashleigh Barty / 
Jennifer Brady defeated Desirae Krawczyk / Bethanie Mattek-Sands, 6–4, 5–7, [10–5].| Event | W | F | SF | QF | Round of 16 | Round of 32 | width=85 | Q | width=85 | Q2 | width=85 | Q1 |
| Singles | 470 | 305 | 185 | 100 | 55 | 1 | 25 | 13 | 1 | |||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
| Doubles | 1 |
| width=130 bgcolor=ededed | Event | width=80 bgcolor=lime | W | width=85 bgcolor=thistle | F | width=85 bgcolor=ffff00 | SF | width=85 bgcolor=ffebcd | QF | width=85 bgcolor=afeeee | Round of 16 | width=85 bgcolor=afeeee | Round of 32 | width=85 | Q2 | width=85 | Q1 |
| style=background:#f3f3f3 | Singles | $55,300 | $41,141 | $26,130 | $12,500 | $6,612 | $5,362 | $4,032 | $2,068 | ||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
| style=background:#f3f3f3 | Doubles | $20,346 | $14,314 | $8,064 | $4,436 | $2,824 |
| Country | Player | Rank1 | Seed | |
|---|---|---|---|---|
| Australia | Ashleigh Barty | 1 | 1 | |
 Romania | Simona Halep | 3 | 2 | |
| United States | Sofia Kenin | 4 | 3 | |
 Ukraine | Elina Svitolina | 5 | 4 | |
| Belarus | Aryna Sabalenka | 7 | 5 | |
 Czech Republic | Karolína Plíšková | 9 | 6 | |
| Czech Republic | Petra Kvitová | 10 | 7 | |
| Belinda Bencic | 12 | 8 |
The following player received a wildcard into the main draw:
The following players received entry from the qualifying draw:
The following players received entry as lucky losers:
Victoria Azarenka → replaced by 
Zhang Shuai
Ekaterine Gorgodze
Johanna Konta → replaced by 
Ekaterina Alexandrova
Elena Rybakina → replaced by Tamara Korpatsch
Iga Świątek → replaced by Angelique Kerber| Country | Player | Country | Player | Rank1 | Seed | |
|---|---|---|---|---|---|---|
| United States | Desirae Krawczyk | United States | Bethanie Mattek-Sands | 40 | 1 | |
| China | Xu Yifan | China | Zhang Shuai | 47 | 2 | |
| United States | Hayley Carter |  Brazil | Luisa Stefani | 52 | 3 | |
| Ukraine | Lyudmyla Kichenok | Jeļena Ostapenko | 65 | 4 |
The following pair received a wildcard into the main draw:
The following pair received entry using a protected ranking:
Ellen Perez / Storm Sanders → replaced by 
Ulrikke Eikeri / Ekaterine Gorgodze