2023 Porsche Tennis Grand Prix – Singles

Defending champion Iga Świątek defeated Aryna Sabalenka in a rematch of the previous year's final, 6–3, 6–4 to win the singles tennis title at the 2023 Stuttgart Open. The final marked the first time the top two players in the world contested a WTA Tour final since the 2018 Australian Open, and the first such match overall since 2019 WTA Finals. This was also the first time since 2005 that the two defending Stuttgart finalists returned to contest the following year's final.

Seeds
The top four seeds received a bye into the second round. • # 🇵🇱 Iga Świątek (champion)

• # Aryna Sabalenka (final)

• # 🇹🇳 Ons Jabeur (semifinals, retired)

• # 🇫🇷 Caroline Garcia (quarterfinals)

• # 🇺🇸 Coco Gauff (second round)

• # 🇰🇿 Elena Rybakina (second round, retired)

• # Daria Kasatkina (first round)

• # Maria Sakkari (first round)

Seeds
• # Petra Martić (qualified)

• # 🇺🇸 Alycia Parks (qualifying competition, lucky loser)

• # 🇨🇿 Linda Fruhvirtová (qualifying competition)

• # 🇺🇸 Katie Volynets (qualifying competition)

• # 🇪🇸 Cristina Bucșa (qualified)

• # 🇩🇪 Tamara Korpatsch (qualified)

• # 🇦🇺 Kimberly Birrell (first round)

• # Ylena In-Albon (qualified)

Qualifiers
• # Petra Martić

• # 🇩🇪 Tamara Korpatsch

• # Ylena In-Albon

• # 🇪🇸 Cristina Bucșa

Lucky loser
• # 🇺🇸 Alycia Parks