Daniela Hantuchova is among the players who have been hitting at the Armeets Arena, which is just a year old.
The arena has not only been home to several sporting events, it has been the venue of some major concerts.
Among those who have performed here are Lady Gaga, Red Hot Chili Peppers, Jennifer Lopez and now the WTA stars.
Hsieh Su-Wei, the only player in the field with two International titles this year, arriving at the airport.
The elite eight of Sofia were treated to make-up and hair sessions by Oriflame ahead of the day's activities.
Roberta Vinci at the styling session. Oriflame, which was founded in 1967, is the Official Cosmetics of the WTA.
Daniela Hantuchova at the Oriflame session. Hantuchova is the official blogger for wtatennis.com this week.
Caroline Wozniacki getting her make-up done by Oriflame. Wozniacki is the No.1 seed at this year's tournament.
Hsieh Su-Wei, Roberta Vinci, Daniela Hantuchova and Caroline Wozniacki were drawn together in Group Serdika.
Zheng Jie, Tsvetana Pironkova, Nadia Petrova and Maria Kirilenko were drawn in the other group, Group Sredets.
The eight players posed for a group photo at the official draw ceremony, which took place at the hotel.
A photo with WTA Chairman and CEO Stacey Allaster at the Ivan Vazov National Theatre, where Hamlet opened Monday.
The media activities Monday morning included press conferences, interviews with the players and round tables.
Tsvetana Pironkova is a Bulgarian trailblazer, the first Bulgarian ever to reach the semifinals of a Grand Slam.
Stacey Allaster at the round tables. There was an incredible amount of media from TV, radio and the press.