At Indian Wells, it's back to serious business for Stan Wawrinka and the Big Four.
Venus Williams will open her season at the ASB Classic in Auckland, New Zealand.
Former Wimbledon champion Petra Kvitova of the Czech Republic beat Angelique Kerber of Germany 6-2, 0-6, 6-3 to win the Pan Pacific Open title on Saturday.
Petra Kvitova rallied to defeat Venus Williams 3-6, 6-3, 7-6 (2) and advance to the Pan Pacific Open final on Friday.
Venus Williams beat Eugenie Bouchard of Canada 6-3, 6-7 (4), 6-3 on Thursday to advance to the semifinals of the Pan Pacific Open.
Venus Williams rallied from a set down to defeat Simona Halep of Romania 4-6, 7-5, 6-3 Wednesday and reach the quarterfinals of the Pan Pacific Open.
Venus Williams upset top-seeded Victoria Azarenka 6-2, 6-4 on Tuesday to advance to the third round of the Pan Pacific Open.
Svetlana Kuznetsova of Russia beat third-seeded Sara Errani of Italy 6-4, 6-4 on Tuesday to reach the third round of the Pan Pacific Open.
Angelique Kerber of Germany advanced to the third round of the Pan Pacific Open by beating Maria-Teresa Torro-Flor 6-0, 6-1 Monday.
Venus Williams overpowered Mona Barthel of Germany 6-3, 6-1 on Sunday to advance to the second round of the Pan Pacific Open.
Russia's Nadia Petrova beat defending champion Agnieszka Radwanska 6-0, 1-6, 6-3 on Saturday to win the Pan Pacific Open.
Defending champion Agnieszka Radwanska will play Nadia Petrova in the final of the Pan Pacific Open.
Sam Stosur knocked two-time champion Maria Sharapova out of the Pan Pacific Open on Thursday, reaching the semifinals with a 6-4, 7-6 (10) victory over the Russian.
Two-time champion Maria Sharapova overpowered Lucie Safarova of the Czech Republic 6-2, 7-6 (5) Wednesday to advance to the Pan Pacific Open quarterfinals.
Top-ranked Victoria Azarenka eased into the third round of the Pan Pacific Open with a 6-1, 6-1 win over Austria's Tamira Paszek on Tuesday.
Marion Bartoli of France advanced to the second round of the Pan Pacific Open with a 6-1, 6-4 win Monday over local favorite Kimiko Date-Krumm, who had to deal with the distraction of a rowdy fan.