2003 State Farm Women's Tennis Classic – Singles

Serena Williams was the defending champion, but was forced to withdraw due to a left knee tendonitis.

Ai Sugiyama won the title by defeating Kim Clijsters 3–6, 7–5, 6–4 in the final.

Seeds
The first four seeds received a bye into the second round. • # 🇺🇸 Serena Williams (withdrew due to a left knee tendonitis)

• # 🇧🇪 Kim Clijsters (final)

• # 🇺🇸 Lindsay Davenport (second round)

• # Jelena Dokic (second round)

• # 🇺🇸 Chanda Rubin (second round)

• # Eleni Daniilidou (quarterfinals)

• # 🇷🇺 Elena Bovina (first round)

• # 🇫🇷 Nathalie Dechy (quarterfinals)