Even before the tournament started there was a lot of buzz around the Bank Of The West Classic.
Marissa Irvin Gould, a former player whose biggest win came at Stanford, unveiled her children's book.
Sam Stosur came along for the ride - A Magical Racquet Ride, the title of Irvin Gould's book.
Irvin Gould's biggest win came against Justine Henin, who was ranked in the Top 10 at the time.
Venus Williams, a two-time champion at the Bank Of The West Classic, stopped off at Ladies' Day.
Every year, Kids Day brings out all kinds of games, activities and player appearances for young fans.
And in this case, balloon animals - most activities take place at the field next to the tournament.
Doubles stars Raquel Kops-Jones and Arantxa Parra Santonja were among the WTA stars taking part.
Sabine Lisicki, now the fastest server of all time in women's tennis, held an autograph session too.
The 2013 Wimbledon finalist also met hall of fame baseball players Willie Mays and Barry Bonds.
All-Access Hour took place on Monday, and Serena Williams was among the players meeting the media.
As was Agnieszka Radwanska, who talked about hardcourts, cheesecake and the WTA Rising Stars...
Tuesday night saw the annual welcome party, where WTA stars like Victoria Azarenka meet the fans.
Radwanska - who was a runner-up at the Bank Of The West Classic last year - also stepped out.
Williams has won the Premier-level tournament in Stanford on her last two visits, in 2011 and 2012.
Angelique Kerber's only previous attempt here was losing in qualies in 2007. But she was No.71 then...
Garbiñe Muguruza, who beat defending champion Dominika Cibulkova earlier in the day, was there too.
Always-entertaining former Top 10 player Andrea Petkovic also stepped out for the welcome party.
And Naomi Osaka, the 16-year-old breakthrough star of this year's tournament, also took the time.
WTA Rising Star Monica Puig was also there. And there's much more to come off the court in Stanford...