Agnieszka Radwanska avenged her US Open loss by defeating Angelique Kerber in the second round.
Maria Kirilenko recorded the first big upset of the tournament, beating No.6 seed Samantha Stosur.
New US Open champion Samantha Stosur was the only Top 8 seed to be upset before the round of 16.
No.12 seed Ana Ivanovic also succumbed to Maria Kirilenko, on the losing end of a 63 61 decision.
No.2 seed Maria Sharapova beat No.13 seed Julia Goerges in their third round match, 76(4) 76(4).
Maria Sharapova met some of the children from Fukushima, where the earthquake and tsunami hit.
Victoria Azarenka, the No.3 seed, spoke to the media after her third round match on Wednesday.
Victoria Azarenka also met with kids from Fukushima, following her post-match press conference.
Kaia Kanepi rallied from two breaks down in the third set to upset Caroline Wozniacki, 75 16 64.
Vera Zvonareva stormed into the quarterfinals of the Toray Pan Pacific Open without losing a set.
Liezel Huber and Lisa Raymond extended their win streak to eight matches with a quarterfinal win.
Marion Bartoli led Victoria Azarenka, 5-4, but lost nine straight games to ultimately fall, 75 60.
Victoria Azarenka improved to 7-1 against Marion Bartoli with a 75 60 quarterfinal win on Thursday.
Barbora Zahlavova Strycova, Jill Craybas, Vladimira Uhlirova and Natalie Grandin at sushi making.
Misaki Doi signing autographs. Doi is Japan's No.3 player after Ayumi Morita and Kimiko Date-Krumm.