Former World No.1 Garbiñe Muguruza, Jelena Ostapenko, Madison Keys, Ashleigh Barty, and Johanna Konta are among those in action on a jam-packed Monday at the Dongfeng Motor Wuhan Open.
Former World No.1 Karolina Pliskova outserved US Open champion Naomi Osaka to end her 10-match winning streak in the Toray Pan Pacific Open final, winning her second title of the season.
With 1,900 points on offer in Wuhan and Bejing, here's how the China Double could make or break the Porsche Race to Singapore.
Sloane Stephens will face her Wimbledon conqueror Donna Vekic again at the Toray Pan Pacific Open next week, while Naomi Osaka will return to her home tournament as a Grand Slam champion for the first time. Scroll down for full draw.
Defending champion Jelena Ostapenko is projected to face Hiroshima winner Hsieh Su-Wei in the KEB Hana Bank Korea Open quarterfinals, while second seed Kiki Bertens has a tough opener in Luksika Kumkhum.
Hsieh Su-Wei lifted her third career trophy at the Hana-Cupid Japan Women's Open after a straight-sets defeat of 17-year-old Amanda Anisimova.
No.8 seed Pauline Parmentier picked up multiple titles in one season for the first time, adding to her 2018 trophy haul by winning the Coupe Banque Nationale présentée par IGA over qualifier Jessica Pegula.
Bethanie Mattek-Sands claimed her eighth Grand Slam title - and her first since coming back from knee injury - partnering with Jamie Murray to win US Open mixed doubles.