Second seed Caroline Wozniacki rallied from a set down to beat qualifier Jarmila Gajdosova and reach the quarterfinals of the Pan Pacific Open.
Ana Ivanovic stalled Victoria Azarenka's comeback from a foot injury with a 6-3, 6-4 win to make the Pan Pacific Open quarterfinals on Wednesday.
Sixth-seeded Dominika Cibulkova beat Kirsten Flipkens of Belgium 6-1, 6-3 to advance to the second round of the Pan Pacific Open on Tuesday.
Lucie Safarova of the Czech Republic rallied from a set down to beat American teenager Madison Keys 6-7 (4), 6-4, 6-2 in the first round of the Pan Pacific Open on Monday.
Now a global superstar, US Open finalist Kei Nishikori has changed the way Asians think about tennis.
Kei Nishikori became the first Japanese man to break into the top 10 of the world tennis rankings on Monday.
Lukas Rosol and Jiri Vesely won their reverse singles on Sunday as the Czech Republic completed a 5-0 sweep of Japan in the Davis Cup quarterfinals.
Radek Stepanek and Lukas Rosol won their singles matches Friday to give the defending champion Czech Republic a 2-0 lead over Japan in the Davis Cup quarterfinals.
Kei Nishikori says he will sit out Japan's Davis Cup quarterfinal against the Czech Republic this weekend due to a groin injury.
Kei Nishikori and Yasutaka Uchiyama beat Frank Dancevic and Daniel Nestor of Canada 6-3, 7-6 (3), 4-6, 6-4 on Saturday to give Japan a 2-1 lead in their Davis Cup world group clash.
Milos Raonic has pulled out of Canada's David Cup World Group tie against Japan with a left foot injury.
Japanese tennis star Kei Nishikori has enlisted the help of Michael Chang as he looks to break into the top 10 in 2014.
Venus Williams will open her season at the ASB Classic in Auckland, New Zealand.
Top-seeded Juan Martin del Potro beat Milos Raonic of Canada, 7-6 (5), 7-5 on Sunday to win the Japan Open and claim his third title of the season.
Top-seeded Juan Martin del Potro overcame Nicolas Almagro 7-6 (7), 7-6 (1) on Saturday to reach the final of the Japan Open.
Top-seeded Juan Martin del Potro overcame Alexandr Dolgopolov of Ukraine 4-6, 6-4, 6-2 to reach the Japan Open semifinals on Friday.