2003 Adidas International – Women's singles

Martina Hingis was the defending champion, but did not compete this year. Hingis would retire from professional tennis one month later.

Kim Clijsters won the title by defeating Lindsay Davenport 6–4, 6–3 in the final. It was the 1st title in the season for Clijsters and the 11th title in her career.

Seeds
The first four seeds received a bye into the second round. • # 🇺🇸 Jennifer Capriati (second round)

• # 🇧🇪 Kim Clijsters (champion)

• # 🇧🇪 Justine Henin-Hardenne (semifinals)

• # 🇸🇰 Daniela Hantuchová (quarterfinals)

• # 🇷🇺 Anastasia Myskina (first round)

• # 🇺🇸 Lindsay Davenport (final)

• # 🇺🇸 Chanda Rubin (quarterfinals)

• # 🇧🇬 Magdalena Maleeva (second round)