After making a winning return at Queen's, Serena Williams' doubles partner Victoria Mboko sustained a knee injury in her singles campaign.
The United States and Switzerland booked their places in the United Cup semi-finals, with Coco Gauff and Belinda Bencic stealing the show.
Naomi Osaka will face Jaqueline Cristian for a place in the final four at the Japan Open after she battled her way past Suzan Lamens.
Iga Swiatek overcame a slight scare against Suzan Lamens at the US Open, while former champion Naomi Osaka cruised past Hailey Baptiste.
No matches available.
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