This week 's Bank of the West Classic in Stanford , California celebrates its 40th year . It is the oldest tournament on the WTA Tour and formed the first event in the WTA Tour calendar . Martina Navratilova holds the record for most singles titles , with five between 1979 and 1993 . American legend Billie Jean King win the first tournament , beating Rosie Casals in the final . The second was won by Martina Navratilova who beat Chris Evert to become the only player ever to hold all four majors at once ( Wimbledon, US Open, Australian Open ).
This week 's Bank of the West Classic in Stanford , California celebrates its 40th year . It is the oldest tournament on the WTA Tour and formed the first event in the WTA Tour calendar . American legend Billie Jean King win the first tournament , beating Rosie Casals in the final . The second was won by Martina Navratilova who beat Chris Evert to become the only player ever to hold all four majors at once ( Wimbledon, US Open, Australian Open ).