2017 Porsche Tennis Grand Prix – Singles

Angelique Kerber was the two-time defending champion, but she lost in the second round to Kristina Mladenovic.

Laura Siegemund won the title, defeating Mladenovic in the final, 6–1, 2–6, 7–6(7–5).

As a result of Kerber's loss, Serena Williams regained the world No. 1 ranking, despite being on pregnancy leave. This tournament also marked the return of Maria Sharapova to the WTA Tour, after serving a 15-month suspension for doping offences.

Seeds
The top four seeds receive a bye into the second round. • #🇩🇪 Angelique Kerber (second round)

• #🇨🇿 Karolína Plíšková (quarterfinals)

• #🇸🇰 Dominika Cibulková (withdrew due to a wrist injury)

• #🇷🇴 Simona Halep (semifinals)

• #🇪🇸 Garbiñe Muguruza (second round)

• #🇬🇧 Johanna Konta (second round)

• #🇵🇱 Agnieszka Radwańska (first round)

• #🇷🇺 Svetlana Kuznetsova (second round)

Seeds
• # 🇯🇵 Naomi Osaka (qualified)

• # Jeļena Ostapenko (qualified)

• # 🇫🇷 Océane Dodin (second round)

• # 🇩🇪 Annika Beck (first round)

• # 🇯🇵 Risa Ozaki (first round)

• # 🇺🇸 Varvara Lepchenko (first round)

• # 🇪🇪 Anett Kontaveit (qualified)

• # 🇺🇸 Jennifer Brady (qualifying competition, Lucky loser)

Qualifiers
• # 🇯🇵 Naomi Osaka

• # Jeļena Ostapenko

• # 🇩🇪 Tamara Korpatsch

• # 🇪🇪 Anett Kontaveit

Lucky loser
• # 🇺🇸 Jennifer Brady