See main article: 2009 Porsche Tennis Grand Prix.
Svetlana Kuznetsova defeated Dinara Safina in the final, 6–4, 6–3 to win the singles tennis title at the 2009 Stuttgart Open. This was the first edition of the tournament played on clay courts, as opposed to hard courts.
Jelena Janković was the defending champion, but lost in the quarterfinals to Flavia Pennetta.