Anett Kontaveit, Madison Keys and Garbine Muguruza enjoyed group-stage victories in the WTA Elite Trophy on Wednesday.
Simona Halep was troubled by injury in a loss to Dominika Cibulkova, while Caroline Garcia was beaten by Katerina Siniakova in Wuhan.
The Wuhan Open began with Kiki Bertens overcoming a hectic 24 hours and Garbine Muguruza earning a measure of revenge.
Naomi Osaka will aim to win her first major title against 23-time grand slam champion Serena Williams, and Madison Keys rates her chances.
Knowing Serena Williams was waiting helped to drive Naomi Osaka on as the Japanese beat Madison Keys to make the US Open final.
Naomi Osaka earned a showdown with Serena Williams in the US Open final after defeating Madison Keys to reach her maiden grand slam decider.
The Arthur Ashe Stadium roof was closed ahead of Serena Williams' US Open semi-final due to the threat of severe weather conditions.
Our latest US Open diary brings you all the latest goings-on from behind the scenes at Flushing Meadows.
Madison Keys is feeling good emotionally and mentally ahead of her US Open semi-final clash with Naomi Osaka.
Madison Keys – the highest seed remaining in New York – defeated Carla Suarez Navarro 6-4 6-3 in Wednesday's quarter-final.