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.
Third-seeded Milos Raonic of Canada overpowered Jeremy Chardy of France 6-4, 6-3 on Thursday to advance to the quarterfinals of the Japan Open.
Top-seeded Juan Martin del Potro advanced to the Japan Open quarterfinals with a comfortable 6-2, 6-2 win over fellow Argentine Carlos Berlocq on Wednesday.
Top-seeded Juan Martin del Potro moved into the second round of the Japan Open with a 4-6, 6-4, 6-3 victory over Marcos Baghdatis of Cyprus on Tuesday.
Second-seeded Jo-Wilfried Tsonga needed four match points to beat Gael Monfils 6-3, 7-6 (8) on Monday to advance to the second round of the Japan Open.
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.