2021 Porsche Tennis Grand Prix

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.

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.

Singles

 * 🇦🇺 Ashleigh Barty defeated 🇧🇾 Aryna Sabalenka, 3–6, 6–0, 6–3.

Doubles

 * 🇦🇺 Ashleigh Barty / 🇺🇸 Jennifer Brady defeated 🇺🇸 Desirae Krawczyk / 🇺🇸 Bethanie Mattek-Sands, 6–4, 5–7, [10–5].

Seeds

 * 1 Rankings are as of 12 April 2021.

Other entrants
The following player received a wildcard into the main draw:
 * 🇩🇪 Andrea Petkovic

The following players received entry from the qualifying draw:
 * 🇩🇪 Mona Barthel
 * 🇳🇴 Ulrikke Eikeri
 * 🇩🇪 Anna-Lena Friedsam
 * 🇩🇪 Julia Middendorf
 * 🇩🇪 Nastasja Schunk
 * Stefanie Vögele

The following players received entry as lucky losers:
 * Ekaterine Gorgodze
 * 🇩🇪 Tamara Korpatsch

Withdrawals

 * Before the tournament
 * 🇧🇾 Victoria Azarenka → replaced by 🇨🇳 Zhang Shuai
 * Kiki Bertens → replaced by Ekaterine Gorgodze
 * 🇬🇧 Johanna Konta → replaced by 🇷🇺 Ekaterina Alexandrova
 * 🇰🇿 Elena Rybakina → replaced by 🇩🇪 Tamara Korpatsch
 * 🇵🇱 Iga Świątek → replaced by 🇩🇪 Angelique Kerber

Seeds

 * 1 Rankings as of 12 April 2021.

Other entrants
The following pair received a wildcard into the main draw:
 * 🇩🇪 Julia Middendorf / 🇩🇪 Noma Noha Akugue

The following pair received entry using a protected ranking:
 * Oksana Kalashnikova / 🇷🇺 Alla Kudryavtseva

Withdrawals

 * Before the tournament
 * Chan Hao-ching / Latisha Chan → replaced by 🇩🇪 Mona Barthel / 🇩🇪 Anna-Lena Friedsam
 * 🇦🇺 Ellen Perez / 🇦🇺 Storm Sanders → replaced by 🇳🇴 Ulrikke Eikeri / Ekaterine Gorgodze