Samantha Stosur dropped some knowledge on some local Osaka high schoolers before the tournament...
The 2011 US Open champion and former World No.4 conducted a tennis clinic with the local youngsters.
Stosur has some very good memories from the HP Open - she won her first WTA title here in 2009.
She has played the tournament every year since it started in 2009 - how has she done overall?
The Australian has made the quarters or better all five tries and is 16-3 here, including this year.
Madison Keys, the youngest player in the Top 80, signed autographs during some down time in Osaka.
And Belinda Bencic, a junior star currently transitioning to the pros, at her first autograph session.
Kimiko Date-Krumm - World No.54, Japanese No.1 - met the press after her win over Laura Robson.
The HP Open player party is always a big hit with the players, and this year there was no exception.
The tournament is currently in its fifth year and has developed one very popular party tradition...
A best dressed competition - was it Sabine Lisicki, Monica Puig, Eugenie Bouchard or Darija Jurak?
The winner was Lisicki - Puig was the runner-up, and Risa Ozaki got the special mention award.
The Japanese players - including Japanese No.2 Ayumi Morita - posed for a photo at the player party.
A group shot. Three have Grand Slam titles, be them in singles, doubles or mixed. Can you spot them?
Bouchard and Robson are the No.1 and No.3 teenagers in the world, respectively. No.2... Keys.