Maria Sharapova won the singles tennis title at the 2009 Pan Pacific Open after Jelena Janković retired from the final with a wrist injury, with the scoreline at 5–2. Dinara Safina was the defending champion, but lost to Chang Kai-chen in the second round.

Seeds

The top eight seeds received a bye into the second round. • # 🇷🇺 Dinara Safina (second round) • # 🇺🇸 Venus Williams (second round) • # 🇷🇺 Elena Dementieva (second round) • # Caroline Wozniacki (second round, retired due to viral illness) • # 🇷🇺 Svetlana Kuznetsova (second round) • # 🇷🇺 Vera Zvonareva (second round) • # Jelena Janković (final, retired due to wrist injury) • # 🇧🇾 Victoria Azarenka (quarterfinals) • # 🇮🇹 Flavia Pennetta (first round) • # 🇷🇸 Ana Ivanovic (first round) • # 🇵🇱 Agnieszka Radwańska (semifinals) • # 🇦🇺 Samantha Stosur (second round) • # 🇷🇺 Nadia Petrova (second round) • # 🇫🇷 Marion Bartoli (quarterfinals) • # 🇨🇳 Li Na (semifinals) • # 🇫🇷 Virginie Razzano (first round)

Draw

Finals

Top half

Section 1

Section 2

Bottom half

Section 3

Section 4