The 2009 Bank of the West Classic was a tennis tournament played on outdoor hard courts. It was the 38th edition of the Bank of the West Classic, and was part of the WTA Premier tournaments of the 2009 WTA Tour. It took place at the Taube Tennis Center in Stanford, California, United States, from July 27 through August 2, 2009. It was the first women's event on the 2009 US Open Series.

WTA entrants

Players committed to participating in the singles event for 2009.

Other entrants

The following players received wildcards into the singles main draw The following players received entry from the qualifying draw:

Finals

Singles

🇫🇷 Marion Bartoli defeated 🇺🇸 Venus Williams, 6–2, 5–7, 6–4

Doubles

🇺🇸 Serena Williams / 🇺🇸 Venus Williams defeated Yung-Jan Chan / 🇷🇴 Monica Niculescu, 6–4, 6–1